WildEarth Guardians v. EPA , 770 F.3d 919 ( 2014 )


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  •                                                             FILED
    United States Court of Appeals
    PUBLISH                  Tenth Circuit
    October 21, 2014
    UNITED STATES COURT OF APPEALS
    Elisabeth A. Shumaker
    TENTH CIRCUIT                  Clerk of Court
    WILDEARTH GUARDIANS;
    HEAL UTAH; NATIONAL PARKS
    CONSERVATION ASSOCIATION;
    POWDER RIVER BASIN
    RESOURCE COUNCIL; SIERRA
    CLUB;
    Petitioners,
    v.                                 Nos. 12-9596, 13-9502, 13-9506,
    13-9507, 13-9508, 13-9509,
    UNITED STATES                                 13-9510
    ENVIRONMENTAL PROTECTION
    AGENCY; GINA McCARTHY,
    Administrator, United States
    Environmental Protection Agency,
    Respondents.
    --------------------
    PUBLIC SERVICE COMPANY OF
    NEW MEXICO; PACIFICORP;
    NEW MEXICO ENVIRONMENT
    DEPARTMENT; BASIN
    ELECTRIC POWER
    COOPERATIVE; STATE OF
    WYOMING; UTAH ASSOCIATED
    MUNICIPAL POWER SYSTEM;
    UTAH DIVISION OF AIR
    QUALITY; CITY OF
    ALBUQUERQUE,
    Intervenors,
    and
    AMERICAN COALITION FOR
    CLEAN COAL ELECTRICITY,
    Amicus Curiae.
    PETITIONS FOR REVIEW OF FINAL DECISIONS ISSUED BY
    THE UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
    Nos. EPA-R06-OAR-2009-0050, EPA-R08-OAR-2011-0400,
    EPA-R08-OAR-2011-0114, EPA-RO6-OAR-2008-0702
    Jenny K. Harbine, Earthjustice, Bozeman, Montana (John Barth, Hygiene,
    Colorado, and Ashley D. Wilmes, WildEarth Guardians, Boulder,
    Colorado, with her on the briefs), for Petitioners.
    Chloe H. Kolman, United States Department of Justice, Environment &
    Natural Resources Division, Washington, D.C. (Stephanie J. Talbert,
    United States Department of Justice, Environment & Natural Resources
    Division, Washington, D.C., Robert G. Dreher, Acting Assistant Attorney
    General, United States Department of Justice, Environment & Natural
    Resources Division, Washington, D.C.; M. Lea Anderson, Of Counsel,
    United States Environmental Protection Agency, Washington, D.C.;
    Matthew C. Marks, Of Counsel, United States Environmental Protection
    Agency, Washington, D.C.; Brian Tomasovic, Of Counsel, United States
    Environmental Protection Agency, Dallas, Texas; Sara L. Laumann, Of
    Counsel, United States Environmental Protection Agency, Denver,
    Colorado, with her on the brief), for Respondent.
    E. Blain Rawson, Ray Quinney & Nebeker, P.C., Salt Lake City, Utah
    (Emily Smith Loeffler, Quinney & Nebeker, P.C., Salt Lake City, Utah,
    Michael G. Jenkins, Assistant General Counsel, PacifiCorp Energy with
    him on the brief), for Intervenor PacifiCorp Energy.
    Matthias L. Sayer, Assistant Attorney General, Wyoming Office of
    Attorney General, Cheyenne, Wyoming (Jay A. Jerde, Deputy Attorney
    General, Wyoming Office of Attorney General, Cheyenne, Wyoming, with
    him on the brief), for Intervenor State of Wyoming.
    2
    Christopher L. Colclasure, Holland & Hart LLP, Denver, Colorado, for
    Intervenor Basin Electric Power Cooperative;
    Richard L. Alvidrez and Robert H. Clark, Miller Stratvert P.A.,
    Albuquerque, New Mexico; Kallie H. Kuehl, Corporate Counsel,
    Albuquerque, New Mexico, on the brief for Intervenor Public Service
    Company of New Mexico.
    Jeffrey M. Kendall, General Counsel and William G. Grantham, Assistant
    General Counsel, for New Mexico Environment Department, on the brief
    for Intervenor New Mexico Environment Department.
    Carol Parker, Assistant City Attorney and Adelia W. Kearny, Deputy City
    Attorney, Albuquerque, New Mexico, on the brief for Intervenor City of
    Albuquerque.
    H. Michael Keller and Mary Jane E. Galvin-Wagg, Van Cott, Salt Lake
    City, Utah; Mason Baker, General Counsel, Salt Lake City, Utah, on the
    brief for Intervenor Utah Associated Municipal Power Systems.
    John E. Swallow, Utah Attorney General and Christian C. Stephens,
    Assistant Attorney General, Salt Lake City, Utah; Craig W. Anderson,
    Division Chief and Assistant Attorney General, Environment Division,
    Utah Attorney General’s Office, Salt Lake City, Utah, on the brief for
    Intervenor Utah Division of Air Quality.
    Paul M. Seby and Marian C. Larsen, Seby Larsen LLP, Denver, Colorado,
    on the brief for Amicus Curiae American Coalition for Clean Coal
    Electricity.
    Before BACHARACH, SEYMOUR, and MURPHY, Circuit Judges.
    BACHARACH, Circuit Judge.
    This appeal grows out of the Clean Air Act. In an effort to comply with
    the statute, three states (New Mexico, Utah, and Wyoming), one city (City of
    Albuquerque), and one county (Bernalillo County) adopted a regional cap-and-
    3
    trade program regulating sulfur-dioxide emissions over the Colorado Plateau. 1
    Under this program, each participant obtained a ceiling on sulfur-dioxide
    emissions. If the ceiling was met, polluters would get allocations of sulfur
    dioxide that could be emitted. With these allocations, polluters had a choice.
    They could use the allocations or cut emissions and trade the unused portions of
    the allocations.
    The program required approval of the Environmental Protection
    Agency. In determining whether to approve the program, the EPA had to
    apply its regulations. Under these regulations, states could satisfy the
    Clean Air Act by ensuring installation of the best available retrofit
    technology in all eligible major sources that contributed to visibility
    impairment. This mode of compliance is referred to as “BART.” States
    affecting visibility over the Colorado Plateau were allowed to use an
    alternative program in lieu of BART. But this alternative program had to
    be better than BART in improving air visibility.
    1
    Final Rule, Approval and Promulgation of State Implementation Plans;
    Wyoming, 77 Fed. Reg. 73,926, 73,926 (Dec. 12, 2012); Final Rule, Approval,
    Disapproval and Promulgation of State Implementation Plans; Utah, 77 Fed. Reg.
    74,355, 74,355 (Dec. 14, 2012); Final Rule, Approval and Promulgation of State
    Implementation Plans; New Mexico, 77 Fed. Reg. 70,693, 70,693 (Nov. 27,
    2012); Final Rule, Approval and Promulgation of State Implementation Plans;
    City of Albuquerque-Bernalillo County, 77 Fed. Reg. 71,119, 71,119 (Nov. 29,
    2012).
    4
    New Mexico, Utah, Wyoming, the City of Albuquerque, and Bernalillo
    County persuaded the EPA that the trading program would yield better results
    than BART because:
    ●     the program covered polluters that would not have been subject
    to BART,
    ●     the program encompassed emissions from new sources, which
    would not have been subject to BART, and
    ●     the program encouraged polluters to expedite equipment
    upgrades and to operate below full capacity.
    Five environmental groups filed petitions for review, 2 arguing that
    the EPA should not have approved the trading program. To decide these
    petitions, we must determine whether the EPA acted arbitrarily and
    capriciously in finding that the trading program was better than BART.
    We conclude that the EPA’s decision was neither arbitrary nor capricious.
    Thus, we deny the petitions for review.
    I.    The Clean Air Act and the EPA’s Regulatory Framework
    The petitions require an understanding of the statutory and regulatory
    requirements for alleviation of air pollution.
    A.    Statutory Requirement for EPA Guidelines
    The Clean Air Act requires the EPA to establish regulations to ensure
    “reasonable progress” toward the improvement in visibility and
    2
    The Petitioners are WildEarth Guardians, Heal Utah, National Parks
    Conservation Association, Powder River Basin Resource Council, and
    Sierra Club.
    5
    “compliance with the requirements of [42 U.S.C. § 7491].” 3 42 U.S.C.
    § 7491(a)(4). In light of this requirement, the EPA had to establish
    regulations requiring states to develop implementation plans to improve
    visibility and adopt, maintain, and enforce air quality standards. 
    Id. §§ 7410(a)(1),
    7491.
    Under the statutory scheme, the EPA would then review the state
    implementation plans to ensure compliance with the Clean Air Act and
    implementing regulations. 
    Id. §§ 7410(a)(3)(B),
    7492(e)(2); see Oklahoma
    v. EPA, 
    723 F.3d 1201
    , 1204 (10th Cir. 2013). Once approved, state
    implementation plans would be enforceable as federal law. 42 U.S.C.
    §§ 7413, 7604.
    States implementing the BART requirement do so in two steps: (1)
    identify the sources subject to BART, and (2) determine the particular
    technologies required for individual sources. 40 C.F.R. § 51.308(e)(1); see
    Util. Air Regulatory Grp. v. EPA, 
    471 F.3d 1333
    , 1335-36 (D.C. Cir.
    2006). In considering the required technologies, states must consider five
    factors for each BART-eligible source:
    (1)   the costs of compliance;
    3
    “Reasonable progress” is measured by comparing “the costs of
    compliance, the time necessary for compliance, . . . the energy and nonair
    quality environmental impacts of compliance, and the remaining useful life
    of any existing [regulated] source” (known as the “four factors”). See 42
    U.S.C. § 7491(g)(1); 40 C.F.R. § 51.308(d)(1)(i)(A).
    6
    (2)   the energy and nonair quality environmental impacts of
    compliance;
    (3)   the existing pollution control technologies already in place;
    (4)   the remaining useful life of the source; and
    (5)   the improvement in visibility anticipated from the use of given
    technologies.
    42 U.S.C. § 7491(g)(2).
    B.    Regulations Governing the Colorado Plateau
    Congress also enacted legislation requiring the EPA to establish a
    visibility transport commission to study regional haze in the Grand Canyon
    and to recommend curative action. 42 U.S.C. § 7492(f).
    To comply, the EPA established the Grand Canyon Visibility
    Transport Commission, which would “assess scientific, technical, and other
    information related to adverse visual air quality impacts from potential or
    projected emissions growth from sources located in the Transport Region.”
    Joint App. at 71. Upon completion of this assessment, the Transport
    Commission would report to the EPA on appropriate measures to improve
    visual air quality on the Colorado Plateau. 
    Id. 4 4
          The EPA expanded the scope of the Grand Canyon Visibility
    Commission’s review to include sixteen Class I areas in the vicinity of the
    Grand Canyon. With this expansion, the Commission addressed visual air
    quality in the “Golden Circle” of parks and wilderness areas in the
    Colorado Plateau. See Notice of Meeting, Grand Canyon Visibility
    Transport Commission, 56 Fed. Reg. 57,522, 57,523 (Nov. 12, 1991).
    7
    1.    The Grand Canyon Visibility Transport Commission
    The Transport Commission analyzed the effects of regional haze in
    sixteen Class I areas 5 affected by pollution in nine states (Arizona,
    California, Colorado, Idaho, Nevada, New Mexico, Oregon, Utah, and
    Wyoming). 6 42 U.S.C. § 7492(c)(1); Final Rule, Regional Haze
    Regulations, 64 Fed. Reg. 35,714, 35,770 (July 1, 1999).
    Based on this analysis, the Transport Commission recommended a
    regional cap-and-trade program for sulfur dioxide that would go into effect
    when participating states exceed an emissions target. Joint App. at 56.
    Details of the program would be worked out later.
    The functions of the Transport Commission were passed on to the
    Western Regional Air Partnership, which continued the study and
    recommended a plan. 
    Id. at 190.
    The plan included:
    (1)   milestones to measure reductions in regional emissions of
    sulfur dioxide, and
    5
    Class I federal areas include all regions as of August 7, 1977,
    consisting of national wilderness areas and national memorial parks
    exceeding 5,000 acres, national parks exceeding 6,000 acres, and
    international parks. See 42 U.S.C. § 7472(a).
    6
    The sixteen Class I areas are the Grand Canyon National Park,
    Sycamore Canyon Wilderness, Petrified Forest National Park, Mount Baldy
    Wilderness, San Pedro Parks Wilderness, Mesa Verde National Park,
    Weminuche Wilderness, Black Canyon of the Gunnison Wilderness, West
    Elk Wilderness, Maroon Bells Wilderness, Flat Tops Wilderness, Arches
    National Park, Canyonlands National Park, Capital Reef National Park,
    Bryce Canyon National Park, and Zion National Park. 40 C.F.R.
    § 51.309(b)(1).
    8
    (2)   a trading program for the nine states.
    The trading program acted as a “backstop,” which would be triggered only
    if the milestones were reached.
    2.    The Regional Haze Rule
    In 1999, the EPA adopted the Transport Commission’s
    recommendations in its Regional Haze Rule, 40 C.F.R. §§ 51.308, 51.309.
    This rule requires states to develop programs that assure reasonable
    progress toward meeting the national goal of addressing visibility
    impairment in Class I areas. 40 C.F.R. § 51.300(a). Sections 51.308 and
    51.309 create two methods of compliance.
    Under the first method, states can submit an implementation plan
    containing emission limitations applying BART for each BART-eligible
    source impairing visibility in a Class I area. 40 C.F.R. § 51.308(e).
    The second method is authorized in 40 C.F.R. § 51.309. Through
    this method, states could use the Transport Commission’s cap-and-trade
    program if participants would expect better results than they would have
    had under BART regulations. The cap-and-trade program is known as the
    “309 program.” 7
    The 309 program establishes voluntary measures to reduce sulfur-
    dioxide emissions through milestones providing “steady and continuing
    7
    States opting for a 309 program still had to comply with § 51.308
    with respect to any other Federal Class I area not encompassed in the 309
    program. 40 C.F.R. § 51.309(a).
    9
    emissions reductions through 2018.” 40 C.F.R. § 51.309(d)(4)(i). After
    2018, the milestone remains constant until the states submit revised
    implementation plans. 
    Id. § 51.309(d)(4)(vi)(A).
    These milestones must
    provide a “50 to 70 percent reduction in [sulfur dioxide] emissions from
    1990 actual emission levels by 2040.” 
    Id. § 51.309(d)(4)(i).
    If sulfur-dioxide emissions surpass the milestone, a backstop
    regional emission trading program would be triggered. Under the program,
    sources are given a set volume of emissions. Any source exceeding its
    allowance must pay a penalty and suffer a loss in its allotted emissions.
    Joint App. at 226-27. To encourage early reductions in emissions, the
    trading program provided additional allocations to sources that reduce
    emissions ahead of schedule.
    Upon approval of an implementation plan, the EPA would regard the
    state to be in compliance through 2018 with the reasonable-progress
    requirement for the sixteen Class I areas encompassed in the 309 program.
    40 C.F.R. § 51.309(a). For additional Class I areas not covered in the 309
    program, the state had to show long-term strategies under § 308. 
    Id. § 51.309(g).
    3.    The D.C. Circuit Court’s Rulings
    After the Western Regional Air Partnership submitted its report,
    Arizona, New Mexico, Oregon, Utah, Wyoming, the City of Albuquerque,
    and Bernalillo County chose to participate in the 309 program.
    10
    Before the EPA acted on these participants’ submissions, the D.C. Circuit
    Court of Appeals invalidated part of the § 51.308(e) methodology
    (requiring evaluation of progress by considering emission reductions in the
    aggregate). Am. Corn Growers Ass’n v. EPA, 
    291 F.3d 1
    , 8-9 (D.C. Cir.
    2002).
    The EPA continued to apply the invalidated methodology in the
    context of determining whether the 309 program was better than BART, but
    the D.C. Circuit Court of Appeals again struck down the EPA’s action in
    Center for Energy & Economic Development v. EPA, 
    398 F.3d 653
    , 660
    (D.C. Cir. 2005). There the court upheld the EPA’s view that an
    alternative program could satisfy the reasonable progress goals. But, the
    court held that the EPA should not have used the invalidated methodology.
    Ctr. for Energy & Econ. 
    Dev., 398 F.3d at 654
    .
    4.   Regional Haze Rule Revisions
    In 2006, the EPA responded to these decisions by revising the
    Regional Haze Rule, making the evaluation of the final BART factor a
    source-by-source determination rather than one based on an evaluation of
    emission reductions in the aggregate. Final Rule, Regional Haze
    Regulations; Revisions to Provisions Governing Alternative to Source-
    Specific BART Determinations, 71 Fed. Reg. 60,612, 60,612-13 (Oct. 13,
    2006). Thus, the participating states had to resubmit implementation
    plans.
    11
    5.      Subsequent Implementation Plans Adopting 309 Program
    Arizona and Oregon decided not to participate in the 309 program.
    But New Mexico, Utah, Wyoming, the City of Albuquerque, and Bernalillo
    County resubmitted plans for a 309 program. In the new plans, the
    participants adjusted the emission milestones to account for withdrawal of
    Arizona and Oregon and reductions already achieved under the 2003
    milestones. Joint App. at 426, 430-38.
    The new implementation plans set the following regional milestones:
    ●    269,083 tons of sulfur dioxide in 2008,
    ●    234,903 tons of sulfur dioxide in 2009,
    ●    200,722 tons of sulfur dioxide in 2010-2012,
    ●    185,795 tons of sulfur dioxide in 2013,
    ●    170,868 tons of sulfur dioxide in 2014,
    ●    155,940 tons of sulfur dioxide in 2015-17, and
    ●    141,849 tons of sulfur dioxide in 2018 and beyond.
    
    Id. at 461.
    When determining whether the 309 program would outperform
    BART, the participants considered BART-eligible sources and other
    sources. Because presumptive rates were not established for the other
    sources, the states analyzed individual sources to determine the emission-
    rate benchmark for sources that were ineligible under BART. 
    Id. 12 The
    309 program set the 2018 milestone to the BART benchmark
    based on the presumptive BART in Appendix Y. But New Mexico, Utah,
    Wyoming, the City of Albuquerque, and Bernalillo County determined that
    the 309 program would outperform BART by:
        encouraging early cuts in emissions,
        including non-BART stationary sources, covering 63 more
    sources that produce emissions,
        capping growth in new sources,
        addressing not only stationary sources but also mobile sources,
    fire, and clean air corridors (which are not covered by BART),
    and
        establishing a “mass-based cap,” which created an absolute
    limit on allowable emissions (unaffected by demand
    fluctuations or operational malfunctions that could increase
    emissions).
    In 2011, New Mexico, Utah, Wyoming, the City of Albuquerque, and
    Bernalillo County revised their implementation plans adopting the 309
    program. In late 2012, the EPA approved the plans, finding that the 309
    program would achieve greater reasonable progress than BART. 
    Id. at 1-
    53. The Petitioners challenge the EPA’s approval of the 309 program.
    II.   Standard of Review
    The Clean Air Act authorizes judicial review of the EPA’s approval
    of state implementation plans, but does not designate the applicable
    standard of review. 42 U.S.C. § 7607(b)(1). In conducting this review, we
    13
    are bound by the Administrative Procedure Act. See Oklahoma v. EPA,
    
    723 F.3d 1201
    , 1211 (10th Cir. 2013) (“We follow the standards of the
    Administrative Procedure Act . . . in reviewing the EPA’s actions under the
    [Clean Air Act].”).
    Under the Administrative Procedure Act, we can reverse agency
    action only if it is “arbitrary, capricious, an abuse of discretion, or
    otherwise not in accordance with law.” 5 U.S.C. § 706(2)(A). This
    standard requires us to determine whether the agency considered the
    relevant data and rationally explained its decision. See In re FCC, 
    753 F.3d 1015
    , 1041 (10th Cir. 2014). Under this standard, we will not disturb
    an agency action unless the agency
    relied on factors which Congress has not intended it to
    consider, entirely failed to consider an important aspect of the
    problem, offered an explanation for its decision that runs
    counter to the evidence before the agency, or is so implausible
    that it could not be ascribed to a difference in view or the
    product of agency expertise.
    Motor Vehicle Mfrs. Ass’n of the U.S., Inc. v. State Farm Mut. Auto. Ins.
    Co., 
    463 U.S. 29
    , 43 (1983).
    If the agency’s “‘path may reasonably be discerned’” from its
    explanation, we will not disturb the action even when the explanation is
    not entirely clear. Alaska Dep’t of Envtl. Conservation v. EPA, 
    540 U.S. 461
    , 497 (2004) (quoting Bowman Transp., Inc. v. Ark.-Best Freight Sys.,
    Inc., 
    419 U.S. 281
    , 286 (1974)). When an agency acts under an “‘unwieldy
    14
    and science-driven statutory scheme[] like the Clean Air Act,’” we afford
    the agency “‘particular deference.’” Nat’l Ass’n of Clean Air Agencies v.
    EPA, 
    489 F.3d 1221
    , 1229 (D.C. Cir. 2007) (quoting Bluewater Network v.
    EPA, 
    372 F.3d 404
    , 410 (D.C. Cir. 2004)).
    III.   The EPA’s Approval of the Implementation Plans
    The environmental groups argue that:
    ●     the 309 program does not achieve greater reasonable progress
    than implementation of BART,
    ●     the 309 program will not achieve reasonable progress toward
    eliminating visibility impairment because only three of the nine
    eligible states participated, and
    ●     New Mexico’s program is deficient based on the failure to
    analyze emissions from the Escalante coal plant.
    We reject each argument.
    A.    The EPA’s Determination that the 309 Program Was Better
    than BART
    The Regional Haze Rule establishes three steps for states to follow
    when determining whether an alternative program is better than BART:
    (1)   establish a BART benchmark and predict emission reductions if
    BART were implemented;
    (2)   predict the emission reductions from an alternative program;
    and
    (3)   compare the two.
    40 C.F.R. § 51.308(e)(2).
    15
    The environmental groups contend that the EPA acted arbitrarily and
    capriciously because:
    ●     the BART benchmark improperly adopted the presumptive
    emission rate established in Appendix Y of the BART
    guidelines,
    ●     the participants misapplied the “clear weight of the evidence”
    standard, and
    ●     the participants overstated the effectiveness of the 309 program
    by inappropriately considering qualitative factors.
    The EPA’s approval of the better-than-BART determination was not
    arbitrary or capricious because:
    ●     the presumptive BART benchmark was appropriate under the
    Clean Air Act and Regional Haze Rule,
    ●     the Regional Haze Rule allows comparison of BART to the
    alternative measure through a “clear weight of the evidence”
    standard, and
    ●     the participants properly considered qualitative factors in
    determining the effectiveness of the 309 program.
    1.    BART Benchmark
    When approving the implementation plans, the EPA concluded: “The
    BART benchmark calculation . . . was not intended to assess actual
    emissions at BART subject sources nor was it intended to assess the
    control capabilities of later installed controls. Instead, the presumptive
    [sulfur dioxide] emissions rate served as a necessary simplifying
    assumption.” Wyoming Rule, 77 Fed. Reg. at 73,929-30.
    16
    The environmental groups challenge this conclusion, arguing that
    source-specific data showed that actual emissions fell below the BART
    benchmark. For this argument, the environmental groups rely on a report
    prepared by their expert witness, Ms. Vicki Stamper. Ms. Stamper
    concluded that source-by-source BART analyses and actual emissions were
    lower than the presumptive BART benchmark used to approve the 309
    program.
    Relying on Ms. Stamper’s conclusions, the environmental groups
    contend that:
    ●     the participants should have conducted a source-by-source
    BART analysis instead of relying on the presumptive BART
    benchmark, and
    ●     the BART benchmark was inappropriate.
    The first argument is untimely. Under federal law, a petitioner has
    only 60 days to sue after the agency acts. 42 U.S.C. § 7607(b)(1); see
    Utah v. EPA, 
    750 F.3d 1182
    , 1184 (10th Cir. 2014). The environmental
    groups failed to comply with this deadline.
    The environmental groups’ second challenge, involving the validity
    of the BART benchmark, fails on the merits.
    a.    The 309 Program’s Presumptive BART Benchmark
    The first challenge requires an understanding of:
    ●     the regulatory requirements for states to establish the BART
    benchmark, and
    17
    ●     how the participants used the presumptive BART benchmark in
    their better-than-BART analyses.
    As noted above, participants in the 309 program had to determine the
    “BART benchmark,” which represents the expected emissions under a
    BART regime. See 40 C.F.R. § 51.308(e)(2).
    The BART benchmark is typically set by determining how much
    sulfur dioxide would be emitted by each BART-regulated source. See 
    id. § 51.308(e)(2)(i)(C)
    (“This analysis must be conducted by making a
    determination of BART for each source subject to BART and covered by
    the alternative program as provided for in [the subsection outlining the
    BART determination].”).
    But an exception exists when the alternative program is designed to
    achieve a requirement other than BART, such as the reasonable progress
    goals. In this situation, a source-by-source BART determination is not
    necessary to determine the BART benchmark. Instead, the state could
    determine the BART benchmark “based on both source-specific and
    category-wide information, as appropriate.” 
    Id. The 309
    program was designed to implement something other than
    BART: the recommendations of the Transport Commission toward
    eradication of regional haze over the Colorado Plateau. Accordingly, the
    participants did not need to conduct source-by-source BART
    18
    determinations to establish the BART benchmark. And the participants did
    not do so.
    Instead, the participants relied on the Western Regional Air
    Partnership’s better-than-BART analysis. As the BART benchmark, the
    Air Partnership determined that “[a]ll utilities that were determined to be
    subject to BART were assumed to be operating at the presumptive emission
    rate established in 40 CFR Part 51, Appendix Y [0.15 pound per million
    British thermal units].” Joint App. at 435.
    The “Appendix Y” presumptive emission rate refers to the EPA’s
    2005 amendment to the Regional Haze Rule, which added guidelines to
    instruct states analyzing individual sources under BART. See 70 Fed. Reg.
    39,131-32; 40 C.F.R. pt. 51, App. Y. In Appendix Y, the EPA established
    a presumptive BART emission rate of 0.15 pound per million British
    thermal units for BART-eligible sources.
    The Western Regional Air Partnership relied on Appendix Y’s
    presumptive emission rate for all but two BART-eligible sources. For
    these two sources (the Hunter and Huntington power plant units), a lower
    BART emission rate of 0.12 pound per million British thermal units was
    used based on limits already in place. Joint App. at 448.
    b.     Timeliness
    The environmental groups argue that the participants should have set
    the BART benchmark by predicting emissions for each BART-regulated
    19
    source (rather than relying on the presumptive rate in Appendix Y). This
    argument is not timely.
    When amending the Regional Haze Rule in 2006, the EPA recognized
    that “the [Appendix Y] presumptions represent[ed] a reasonable estimate of
    a stringent case BART.” 71 Fed. Reg. at 60,619. In light of the
    reasonableness of this estimate, the EPA decided in 2006 that participants
    could rely on the presumptive rate when attempting to meet a requirement
    other than BART. By using the presumptive rate, participants could avoid
    the need to predict emissions for each source under a BART system of
    regulation. 
    Id. at 60,618-19.
    The environmental groups argue that the participants should have
    conducted their own source-specific BART analyses. In the absence of
    these analyses, the environmental groups contend that the EPA arbitrarily
    approved use of the presumptive BART benchmark. In effect, this
    contention challenges the EPA’s 2006 amendment establishing use of the
    presumptive BART benchmark. We can adopt this view only if we
    conclude that the EPA erred in adopting the Appendix Y BART as a
    presumptive benchmark. 8
    8
    The environmental groups deny that they are asserting a need for a
    source-by-source BART determination. But in her expert report, Ms.
    Stamper stated that § 51.308(e)(2)(i)(C) required a source-by-source BART
    determination. Joint App. at 684. And the environmental groups rely
    heavily on this report in criticizing the presumptive BART benchmark.
    20
    It is too late for the Petitioners to make this argument. If the
    environmental groups wished to challenge adoption of Appendix Y as the
    presumptive BART emission rate, they had to file a petition for review
    within 60 days of the EPA’s publication of the 2006 amendment to the
    Regional Haze Rule. See 42 U.S.C. § 7607(b)(1); Utah v. EPA, 
    750 F.3d 1182
    , 1184 (10th Cir. 2014). That amendment was published in the
    Federal Register on October 13, 2006, and the petitions for review were
    not filed until more than six years later (December 2012 and January
    2013). See 71 Fed. Reg. at 60,612; 40 C.F.R. Pt. 51, App. Y.
    Accordingly, we lack jurisdiction over a challenge to the EPA regulation
    authorizing use of Appendix Y in lieu of a source-by-source determination.
    See 
    Utah, 750 F.3d at 1184
    ; Utah v. EPA, ___ F.3d ___, Nos. 13-9535, 13-
    9536, 
    2014 WL 4345770
    , at *5 (10th Cir. Sept. 3, 2014).
    Pet’rs’ Opening Br. at 34, 41 (arguing that the presumptive BART was
    “much less stringent than source-by-source BART determinations”).
    In their reply brief, the environmental groups retreat from this
    argument: “Contrary to EPA’s assertions in its answering brief, Petitioners
    do not contend that states participating in the 309 Program must conduct
    source-by-source BART determinations based on the methodology in 40
    C.F.R. § 51.308(e)(1) and the BART Guidelines in order to develop a valid
    BART benchmark.” Pet’rs’ Reply Br. at 6.
    Even if the environmental groups had not retreated from this
    argument, it would have been untimely. Thus, we need not address the
    parties’ disagreement over Ms. Stamper’s opinions on emissions from
    BART-regulated sources. See, e.g., Industry Intervenors’ Response Br. at
    34.
    21
    c.   Actual Emissions Lower than the Presumptive BART
    Emission Rate
    The environmental groups also invoke § 51.308(e)(2)(i)(C), arguing
    that the EPA should have considered whether use of category-wide
    information was “appropriate.” Pet’rs’ Reply Br. at 26; see 40 C.F.R.
    § 51.308(e)(2)(i)(C). 9 This argument stems from unreasonable assumptions
    about the information available to the states when they submitted their
    plans.
    According to the environmental groups, most BART-eligible sources
    emitted less sulfur dioxide than the presumptive benchmark would allow
    and the EPA elsewhere projected even lower presumptive emission rates.
    In the face of this data, the environmental groups argue that
    § 51.308(e)(2)(i)(C) would prohibit states from relying on Appendix Y’s
    presumptive BART rate.
    9
    The environmental groups argue:
    Petitioners challenge EPA’s application of th[e] authorization
    [to use a simplifying presumption] and interpretation to
    establish the BART benchmark despite readily available
    category-wide    and   source-specific  evidence    that   the
    presumptive rate is not an “appropriate” simplifying
    assumption because it grossly underestimates the emission
    reductions achievable by installing BART at the affected
    sources.
    Pet’rs’ Reply Br. at 26.
    22
    This argument is based largely on the report of Ms. Stamper, who
    said that 17 of the BART-eligible sources had emission rates that dipped
    below the rates allowed in Appendix Y. Reliance on Ms. Stamper’s report
    is misguided. Ms. Stamper relied on contemporaneous measures of
    emissions post-dating the participants’ implementation plans, and the EPA
    regulations expressly allowed reliance on the presumptive rate.
    The Western Regional Air Partnership submitted its better-than-
    BART determination in October 2010, and the participants relied on this
    determination in their 2011 implementation plans. Joint App. at 435; see
    Final Rule, Approval and Promulgation of State Implementation Plans;
    Wyoming, 77 Fed. Reg. 73,926, 73,926 (Dec. 12, 2012); Final Rule,
    Approval, Disapproval and Promulgation of State Implementation Plans;
    Utah, 77 Fed. Reg. 74,355, 74,355 (Dec. 14, 2012); Final Rule, Approval
    and Promulgation of State Implementation Plans; New Mexico, 77 Fed.
    Reg. 70,693, 70,693 (Nov. 27, 2012); Final Rule, Approval and
    Promulgation of State Implementation Plans; City of Albuquerque-
    Bernalillo County, 77 Fed. Reg. 71,119, 71,119 (Nov. 29, 2012).
    The environmental groups contend that the participants should have
    accounted for actual emissions. The EPA could reasonably conclude that
    inclusion of Ms. Stamper’s data would have been infeasible, for the better-
    than-BART determination resulted from coordinated efforts by the
    23
    participants over several years 10 and much of the omitted data did not even
    exist until this process had almost come to an end. Thus, the EPA rejected
    the environmental groups’ insistence that the participants should have
    incorporated the new data. Joint App. at 30-31. This conclusion was not
    arbitrary or capricious. See San Luis & Delta-Mendota Water Auth. v.
    Jewell, 
    747 F.3d 581
    , 620-21 (9th Cir. 2014) (holding that the Fish and
    Wildlife Service’s choice of a baseline, though imperfect, was not arbitrary
    or capricious because removal of the imperfections would not have been
    feasible).
    Reliance on Ms. Stamper’s data was not only infeasible, but also
    invalid under the EPA regulations. These regulations expressly allowed
    participants to use the presumptive benchmark to predict emissions instead
    of assessing how much pollution would be emitted from each source under
    a BART regime. 71 Fed. Reg. at 60,618-19. Ms. Stamper’s analysis
    suggests that the presumptive benchmark is overly generous for some
    sources. But imprecision is inherent in the nature of a simplifying
    assumption.
    In arguing that the EPA disregarded site-specific information, the
    environmental groups refer to two units (the Hunter Unit 1 and the Dave
    Johnson Unit 4) and point out that the EPA used actual emissions in the
    Cross-State Air Pollution Rule. See Final Rule, Regional Haze; Revision
    10
    Joint App. at 175, 426.
    24
    to Provisions Governing Alternatives to Source-Specific BART
    Determinations, 77 Fed. Reg. 33,642, 33,649 (June 7, 2012); Proposed
    Rule, Regional Haze; Revisions to Provisions Governing Alternatives to
    Source-Specific BART Determinations, 76 Fed. Reg. 82,219, 82,225-26
    (Dec. 30, 2011).
    The EPA’s use of actual emissions in one rule does not require the
    EPA to use actual emissions in every rule. And, the regulations expressly
    allow participants to use the benchmark in lieu of actual emissions. Thus,
    the EPA interpreted its Regional Haze Rule and concluded:
    ●     “[T]here is no need to develop a precise estimate of the
    emissions reductions that could be achieved by BART in order
    simply to compare two programs,” and
    ●     “the [Appendix Y] presumptions represent a reasonable
    estimate of a stringent case BART.”
    71 Fed. Reg. at 60,618-19.
    This interpretation was reasonable. Section 51.308 mandates the use
    of source-specific and category-wide information “as appropriate.” 40
    C.F.R. § 51.308(e)(2)(i)(C). Information may be appropriate in one
    context, but not another. Section 51.308 provides flexibility in what may
    be considered, and the EPA reasonably interpreted that provision.
    d.    The EPA’s Statements Regarding Appendix Y’s Presumptive
    BART
    The environmental groups also argue that the presumptive rate (0.15
    pound per million British thermal units) is rebuttable and serves only as
    25
    the starting point of the BART analysis. Pet’rs’ Opening Br. at 42. This
    argument is rejected.
    For this argument, the environmental groups refer to other rules in
    which the EPA has clarified the BART analysis for states and the role of
    Appendix Y. 
    Id. at 43.
    For example, the environmental groups point to
    the rejection of Arkansas’ implementation plan, where the EPA said that
    states must “‘consider the level of control that [was] currently achievable
    at the time the BART analysis [was] being conducted.’” 
    Id. (quoting Final
    Rule; Approval and Promulgation of Implementation Plans; Arkansas, 77
    Fed. Reg. 14,604, 14,613-14 (Mar. 12, 2012)).
    This argument overlooks a critical distinction. In the cited instances,
    the states were conducting a BART analysis. Here, they weren’t. Instead,
    the participants in our case were conducting a better-than-BART
    determination. This analysis required a comparison of the 309 program to
    the BART benchmark, which adopted Appendix Y’s presumptive BART as
    a simplifying assumption. The environmental groups have not identified
    any authority requiring a source-by-source analysis for states conducting a
    309 program.
    2.    Comparison of the 309 Program to BART
    At the second and third stages of the better-than-BART analysis, the
    participant must:
    26
    (1)   predict the emission reductions achieved by implementing the
    alternative program (the second stage), and
    (2)   compare the effectiveness of the alternative measure to the
    effectiveness of implementing BART (the third stage).
    40 C.F.R. § 51.308(e)(2)(i)(D), (E). The environmental groups challenge
    the EPA’s approval at both stages.
    At the third stage, the groups claim that the participants used an
    improper method of comparison. And at the second stage, the groups
    allege improper reliance on qualitative factors to bolster the effectiveness
    of the 309 program. Because the applicability of qualitative factors at the
    second stage depends on the method used at the third stage, we first
    address whether the participants used the proper method to compare the
    309 program to BART.
    a.    Comparison of the Milestones (in the 309 Program) to BART
    The EPA compared the 309 program as a whole to BART. The
    environmental groups suggest in their reply brief that the EPA should have
    compared the 309 program milestones (rather than the 309 program as a
    whole) to the effectiveness of BART. See 40 C.F.R. § 51.309(d)(4)(i).
    But we cannot entertain this suggestion because it was unexhausted and
    omitted in the environmental groups’ opening brief.
    Under the Clean Air Act, “[o]nly an objection to a rule or procedure
    which was raised with reasonable specificity during the period for public
    comment (including any public hearing) may be raised during judicial
    27
    review.” 42 U.S.C. § 7607(d)(7)(B); see EPA v. EME Homer City
    Generation, L.P., __ U.S.__, 
    134 S. Ct. 1584
    , 1602 (2014) (holding that
    satisfaction of § 7607(d)(7)(B) was mandatory, but not jurisdictional). But
    the environmental groups failed to raise this issue in the EPA proceedings.
    That failure renders the claim unexhausted. See Oklahoma v. EPA, 
    723 F.3d 1201
    , 1214-15 (10th Cir. 2013).
    Even in the present action, the environmental groups did not raise the
    issue until they filed their reply brief. By then it was too late to raise a
    new issue. See M.D. Mark, Inc. v. Kerr-McGee Corp., 
    565 F.3d 753
    , 768
    n.7 (10th Cir. 2009) (the “general rule in this circuit is that a party waives
    issues and arguments raised for the first time in a reply brief”).
    We decline to entertain this issue, for it was not exhausted or raised
    in the environmental groups’ opening brief.
    b.    Consideration of Qualitative Factors
    The EPA determined that the 309 program as a whole was more
    effective than a fully implemented BART regime because the 309 program:
    (1)   included non-BART sources of sulfur-dioxide emissions,
    (2)   included new sources of emissions,
    (3)   created a “mass-based” cap covering emissions in the
    aggregate, and
    (4)   encouraged early reductions in emissions.
    28
    The environmental groups characterize this rationale as qualitative and
    argue that the EPA should instead have focused solely on quantitative
    considerations. We reject this argument.
    i.    Failure to Use § 51.308(e)(3)’s Method
    According to the environmental groups, a quantitative approach was
    required in 40 C.F.R. § 51.308(e)(3). Instead of using one of the
    quantitative methods, the groups continue, the EPA improperly applied a
    qualitative standard (“clear weight of the evidence”).
    Section 51.308(e)(2)(i) sets out the process to compare an alternative
    program to BART. This section did not initially articulate a method for
    the comparison. The EPA considered a method that would compare the
    “expected visibility improvement under the alternative program and under
    BART according to the criteria established in § 51.308(e)(3).” Proposed
    Rule, Regional Haze Regulations; Revisions to Provisions Governing
    Alternative to Source-Specific BART Determinations, 70 Fed. Reg. 44,154,
    44,158 (Aug. 1, 2005). The EPA also sought comment on: (1) whether
    § 51.308(e)(3) provided the sole way to demonstrate greater reasonable
    progress, or (2) whether qualitative factors could be considered. 
    Id. In 2006,
    the EPA determined that § 51.308(e)(3) should not serve as
    the only means to show “greater reasonable progress.” Thus, the EPA
    amended § 51.308(e)(2)(i) to add “E,” which authorized use of the “clear
    weight of evidence” standard as a way of showing that the alternative
    29
    program was better than BART. Final Rule, Regional Haze Regulations;
    Revisions to Provisions Governing Alternative to Source-Specific BART
    Determinations, 71 Fed. Reg. 60,612, 60,622 (Oct. 13, 2006). Under
    § 51.308(e)(2)(i)(E), the better-than-BART analysis may be made “under
    paragraph (e)(3) of this section or otherwise based on the clear weight of
    evidence that the trading program or other alternative measure achieves
    greater reasonable progress than would be achieved through the installation
    and operation of BART at the covered sources.” 40 C.F.R.
    § 51.308(e)(2)(i)(E).
    Accordingly, the regulation establishes two ways that a state can
    compare a 309 program to BART. The state can use the two quantitative
    methods stated in § 51.308(e)(3) or apply a qualitative standard (the clear
    weight of evidence). See 71 Fed. Reg. at 60,622 (“With respect to the use
    of a ‘weight of evidence’ approach as an alternative to the methodology of
    section 51.308(e)(3), we support the use of such a test as an alternative to
    the methodology set forth in section 51.308(e)(3).”).
    The participants chose the qualitative standard, which was
    permissible under the EPA’s interpretation of its regulations. See Fed.
    Express Corp. v. Holowecki, 
    552 U.S. 389
    , 397 (2008) (“Just as we defer to
    an agency’s reasonable interpretations of [its authorizing] statute when it
    issues regulations in the first instance, . . . the agency is entitled to further
    30
    deference when it adopts a reasonable interpretation of regulations it has
    put in force.” (citation omitted)).
    ii.   Qualitative v. Quantitative Factors
    The environmental groups argue that even if § 51.308(e)(3) did not
    furnish the exclusive methodology, the participants should not have relied
    on qualitative factors because:
    (1)   the EPA sought comment on, but did not adopt, a “qualitative”
    means of evaluating whether an alternative program was better
    than BART, and
    (2)   when adding a “clear weight of the evidence” standard, the
    EPA identified only quantitative emissions and visibility data
    as appropriate for a better-than-BART determination.
    These arguments do not suggest arbitrariness or capriciousness by the
    EPA. Both arguments depend on the environmental groups’ interpretation
    of the EPA regulations. The EPA expressly concluded that a participant
    could use the “clear weight of the evidence” standard. When using this
    standard, however, the EPA sanctioned consideration of “all available
    information.” 11 There was no prohibition against the consideration of
    qualitative evidence.
    11
    In its final rule adding the “clear weight of the evidence” standard as
    one means of determining that an alternative program was better than
    BART, the EPA clarified:
    “Weight of evidence” demonstrations attempt to make use of all
    available information and data which can inform a decision
    while recognizing the relative strengths and weaknesses of that
    information in arriving at the soundest decision possible.
    31
    It is true that the EPA provided examples that are quantitative. See
    Final Rule, Regional Haze Regulations; Revisions to Provisions Governing
    Alternative to Source-Specific BART Determinations, 71 Fed. Reg. 60,612,
    60,622 (Oct. 13, 2006). But the EPA pointed out that these examples were
    not exhaustive and that the determination should be based on “all available
    information and data which can inform a decision while recognizing the
    relative strengths and weaknesses of that information in arriving at the
    soundest decision possible.” 
    Id. Because this
    language supports the EPA’s interpretation of its
    regulation, we do not regard the use of qualitative factors as arbitrary or
    Factors which can be used in a weight of evidence
    determination in this context may include, but not be limited to,
    future projected emissions levels under the program as
    compared to under BART, future projected visibility conditions
    under the two scenarios, the geographic distribution of sources
    likely to reduce or increase emissions under the program as
    compared to BART sources, monitoring data and emissions
    inventories, and sensitivity analyses of any models used. This
    array of information and other relevant data may be of
    sufficient quality to inform the comparison of visibility impacts
    between BART and the alternative program. In showing that an
    alternative program is better than BART and when there is
    confidence that the difference in visibility impacts between
    BART and the alternative scenarios are expected to be large
    enough, a weight of evidence comparison may be warranted in
    making the comparison. The EPA will carefully consider the
    evidence before us in evaluating any [state implementation
    plans] submitted by States employing such an approach.
    Final Rule, Regional Haze Regulations; Revisions to Provisions Governing
    Alternative to Source-Specific BART Determinations, 71 Fed. Reg. 60,612,
    60,622 (Oct. 13, 2006) (emphases added).
    32
    capricious. See Fed. Express Corp. v. Holowecki, 
    552 U.S. 389
    , 397
    (2008).
    c.    The Qualitative Factors
    The EPA relied on four factors that could be considered
    “qualitative”:
    (1)   The trading program included sources not subject to BART
    regulation;
    (2)   the trading program discouraged emissions from new sources
    more effectively than a BART regime would have done;
    (3)   the trading program included an aggregate cap on emissions,
    which would have decreased emissions more effectively than
    BART; and
    (4)   the trading program encouraged earlier reductions than under a
    BART regime.
    Joint App. at 31-32. These considerations provided a reasonable basis for
    the EPA’s approval of the 309 program.
    i.    Emission Reductions from Non-BART Sources
    In concluding that the 309 program would outperform BART, the
    EPA relied in part on inclusion of “all sources with emissions greater than
    100 tons/year of [sulfur dioxide].” See 
    id. at 516.
    The threshold for
    regulation under BART would have been much higher. See 40 C.F.R.
    § 51.301 (stating that sources are eligible for BART if they can emit 250
    tons of sulfur dioxide per year, were built between 1962 and 1977, and fall
    within one of the specified source categories).
    33
    The environmental groups criticize the EPA for considering potential
    reductions in emissions involving non-BART sources. The groups argue
    that rather than consider non-BART sources, the EPA should have confined
    its analysis to BART-eligible sources.
    We disagree. The environmental groups are relying on regulatory
    language applicable to the first step of the better-than-BART analysis (the
    determination of the BART benchmark), not the comparison of BART to
    the alternative program.
    Under 40 C.F.R. § 51.308(e)(2)(i), subsections “A” through “C”
    outline the requirements to determine the BART benchmark, the first step
    of the better-than-BART determination. 40 C.F.R. § 51.308(e)(2)(i)(A)-
    (C). Subsection “D” addresses the second step: “[a]n analysis of the
    projected emissions reductions achievable through the trading program or
    other alternative measure.” 
    Id. § 51.308(e)(2)(i)(D).
    And, as previously
    discussed, subsection “E” states how one compares the relative successes
    of the alternative program and BART, the third and final step in the better-
    than-BART analysis. 
    Id. § 51.308(e)(2)(i)(E)
    (requiring a comparison of
    “the trading program or other alternative measure” with BART).
    Accordingly, the environmental groups are mistaken. The EPA could
    reasonably read “D” and “E” to allow comparison of BART to the entirety
    of the alternative program (including the non-BART-eligible sources).
    34
    Thus, the EPA acted reasonably when it considered non-BART sources at
    the second and third steps of the better-than-BART determination.
    ii.   Emission Reductions from New Sources
    The environmental groups also argue that the EPA incorrectly
    considered emission reductions from new sources. New sources would not
    be subject to BART because they would have been built after 1977. See 
    id. § 51.301.
    The groups contend that new sources are already subject to
    regulations that are more effective than a cap on emissions in the 309
    program. We reject this contention.
    As the environmental groups state, new sources of emissions are
    independently regulated by the Clean Air Act. 42 U.S.C. §§ 7411, 7475,
    7503; see United States v. DTE Energy Co., 
    711 F.3d 643
    , 644-45 (6th Cir.
    2013) (“New Source Review [under the Clean Air Act] forbids the
    construction of new sources of air pollution without a permit.”). Thus,
    even without the trading program, new sources would need to show that
    they meet emission standards based on the “best available control
    technology.” 42 U.S.C. § 7475(a)(4). But, the EPA could reasonably
    conclude that the 309 program would go beyond the existing regulatory
    process in reducing emissions from new sources.
    The environmental groups contend that a cap would prove
    meaningless by allowing new sources to obtain allocations equaling the
    maximum emissions already allowed. We disagree.
    35
    Under the new-source regulatory scheme, new-source emissions were
    limited but not capped. The EPA set out to establish a cap through
    approval of 309 programs. With caps, the EPA expected polluters to adopt
    voluntary measures to reduce emissions. Joint App. at 431-32, 438. The
    EPA coupled this strategy with regulation for new sources. 
    Id. This two-
    fold strategy for new sources had a reasonable foundation: The EPA hoped
    to reduce emissions for new sources by regulating them and encouraging
    voluntary reductions in emissions. 
    Id. at 31-32.
    According to the environmental groups, the cap is ineffective
    because it accommodated construction of all projected new electric
    generating units proposed, which renders the “cap” on future sources no
    better than the new-source regulatory scheme. 
    Id. at 212,
    432. Under the
    309 program, however, the 2018 milestone continues as an emission cap
    for sulfur dioxide until the participants obtain approval of revised
    implementation plans. Accordingly, any post-2018 growth will be limited
    unless a revised implementation mandates otherwise. In view of this
    strategy by the EPA, its consideration of new sources was not arbitrary or
    capricious.
    iii.    “Mass-Based Cap” on Sulfur-Dioxide Emissions
    The environmental groups also contend that:
    (1)     the EPA improperly relied on the purported benefits of a
    “mass-based cap” on sulfur-dioxide emissions,
    36
    (2)   the mass-based cap cannot outperform BART because the cap
    assumes that sources were operating at 85% capacity when
    many of those sources were actually operating at lower
    capacity,
    (3)   setting the assumption of capacity so high allows sources to
    actually increase emissions, and
    (4)   BART would reduce emission rates across all operations even
    when they are operating at less than full capacity.
    The EPA disagreed and had a reasonable foundation for its disagreement.
    
    Id. at 31-32.
    The Western Regional Air Partnership designed the mass-based cap
    to allow for an increase in operating capacity at existing sources in light of
    a projected increase in electrical needs. By setting the assumed capacity at
    85%, designers of the program established room for sources to adapt to
    future needs. The EPA approved the mass-based cap only after concluding
    that a cumulative limit on emissions would be more effective than BART.
    It is true that a source’s presumptive capacity may be higher than the
    actual capacity at any given time. But this possibility does not render the
    EPA action arbitrary or capricious. The participants followed the concept
    stated by the Western Regional Air Partnership, setting a cap based on
    projected increases in electrical needs and accommodation of future
    growth. 
    Id. at 32.
    Based in part on the Air Partnership’s analysis, the
    EPA determined that the 309 program would be better than a BART system
    of regulation. 
    Id. This determination
    was not arbitrary or capricious.
    37
    iv.     Early Emission Reductions
    In 1996, the Transport Commission recommended that the market
    trading program “contain specific provisions to encourage and reward early
    emission reductions, including reductions achieved before 2000.” 
    Id. at 437
    (internal quotation marks omitted). Following this recommendation,
    the participants provided additional allocations to sources that reduce
    emissions ahead of schedule.
    In its 2010 report, the Western Regional Air Partnership concluded
    that participants in the trading program had decreased sulfur-dioxide
    emissions:
    ●       25% between 1990 and 2000 in the nine states eligible to
    participate in the 309 program, and
    ●       an additional 31% between 2000 and 2008 in the participating
    states.
    
    Id. at 438.
    The Western Regional Air Partnership attributed these
    reductions to the 2003 implementation plans.
    The environmental groups question the connection between the early
    reductions and the 309 program. But the EPA never attributed the early
    reductions to the 309 program. Instead, the EPA simply said that it could
    not discount the possibility of a causal relationship. For example, when
    approving the 309 program, the EPA stated that it could not “discount that
    the 2003 309 [state implementation plan] submittal may have already
    influenced sources to upgrade their plants before any case-by-case BART
    38
    determination under Section 308 may have required it.” Final Rule,
    Approval and Promulgation of State Implementation Plans; Wyoming, 77
    Fed. Reg. 73,926, 73,930 (Dec. 12, 2012).
    In oral argument, the EPA acknowledged that it was aware of the
    early reductions, but did not explicitly attribute them to the 309 program.
    Instead, the EPA argued that proof of a causal relationship was
    unnecessary. Oral Arg. 31:45-35:29. We agree: The EPA was not
    required to prove a causal relationship between the already-achieved
    emission reductions and the decade-long progression of the 309 program.
    Rather, in its better-than-BART determination of the 309 program, the EPA
    had to predict whether the alternative program would yield greater
    reductions than a fully-implemented BART regime. See 40 C.F.R.
    § 51.308(e)(2)(i).
    The existing reductions tended to support the soundness of a strategy
    encouraging early reductions through the 309 program. The EPA had no
    need to go further by proving actual causation between the strategy and the
    early reductions. Thus, the EPA did not act arbitrarily or capriciously in
    considering the early-reduction incentives.
    d.    Summary
    The approval of the participants’ better-than-BART determination
    was not arbitrary or capricious, and we reject the criticism of the EPA’s
    39
    reliance on qualitative factors and application of the “clear weight of the
    evidence” standard.
    B.    “Critical Mass” of Participating States in 309 Program
    We must also address the soundness of the 309 program based on the
    number of states and tribes refusing to participate. Six out of the nine
    eligible states refused to participate, as did every one of the 211 eligible
    tribes. Joint App. at 426, 652. The environmental groups argue that
    without greater participation, the 309 program was doomed to fail. The
    EPA acted reasonably in rejecting this argument.
    1.    Timeliness
    The EPA contends that this challenge was not raised in a timely
    manner. For this contention, the EPA characterizes the challenge as an
    attack on the Regional Haze Rule.
    We disagree with this characterization. The environmental groups
    are not questioning the absence of a critical mass requirement in the
    Regional Haze Rule. Instead, the groups are contending that the
    participating states are too few to satisfy the statutory goal of reasonable
    progress. The groups’ contention addresses the EPA’s approval, rather
    than the validity of the Regional Haze Rule. This contention is timely.
    40
    2.    The Absence of a Statutory or Regulatory Requirement of
    Minimum Participation
    Though the argument is timely, it is invalid because neither the Clean
    Air Act nor the EPA regulations require participation by a certain number
    of states or tribes. See 40 C.F.R. § 51.309(a), (e).
    Without a statutory or regulatory requirement, the environmental
    groups rely on the EPA’s proposed 2002 rulemaking. There the EPA
    stated:
    The requirements in 40 CFR 51.309, if revised, will be
    the product of a substantial effort by many States, Tribes,
    Federal agencies, and other interested parties, extending over a
    number of years from the work of the [Grand Canyon Visibility
    Transport Commission] to that of the [Western Regional Air
    Partnership]. The EPA recognizes, however, that the States and
    Tribes do have the option of implementing the regional haze
    rule under 40 CFR 51.308 rather than 40 CFR 51.309. Because
    the objective of 40 CFR 51.309 is to provide a regional
    approach to protecting air quality at the 16 Class I areas on the
    Colorado Plateau, EPA believes that there must be a “critical
    mass” of States participating for 40 CFR 51.309 [state
    implementation plans] to be approvable.
    Proposed Rule, Proposed Revisions to Regional Haze Rule to Incorporate
    Sulfur Dioxide Milestones and Backstop Emissions Trading Program, 67
    Fed. Reg. 30,418, 30,420 (May 6, 2002); see also Final Rule, Revisions to
    Regional Haze Rule to Incorporate Sulfur Dioxide Milestones and
    Backstop Emissions Trading Program, 68 Fed. Reg. 33,764, 33,770 (June
    5, 2003) (“The EPA continues to believe, as discussed in the proposal, that
    41
    judgments on the issue of ‘critical mass’ are best left to the [Western
    Regional Air Partnership].”).
    Later in this proposed revision, however, the EPA indicated that it
    would “defer to the [Western Regional Air Partnership’s] judgment on the
    issue of ‘critical mass,’ and . . . request[ed] comment on this proposal.”
    67 Fed. Reg. at 30,427. And the Western Regional Air Partnership did not
    require participation by a minimum number of states or tribes. See Joint
    App. at 174-267. 12 Accordingly, the EPA did not impose such a
    requirement. See 77 Fed. Reg. at 24,769-70 (“Section 51.309 does not
    require the participation of a certain number of States to validate its
    effectiveness.”).
    12
    Instead, the Air Partnership proposed further study on the number
    and diversity of sources needed to make the program viable:
    The Annex has been developed based on the Grand
    Canyon Visibility Transport Commission recommendations,
    which assumed that all of the states and tribes in the transport
    region would participate in the program. The regional haze
    rule establishes two paths for states: implement the
    Commission recommendations, including the backstop trading
    program under §309; or develop an independent plan under
    §308. An important issue still to be addressed is the effect on
    the trading program if one or more states and tribes do not
    choose to participate. Will there be enough sources or enough
    diversity in the program to create a viable market? Will the
    administrative costs of the program be justifiable with a
    smaller group of states and tribes? To address these questions,
    the [Western Regional Air Partnership] needs to evaluate the
    economics of the program, and determine the critical mass that
    is needed to create a viable program.
    Joint App. at 234.
    42
    3.    The Environmental Groups’ Arguments on the Soundness of
    the EPA’s Conclusion
    The environmental groups argue that not enough states are
    participating to allow reasonable progress because:
    ●     the three states participating in the 309 program contribute
    only a small percentage of the sulfur dioxide in Utah’s Class I
    areas and the Colorado Plateau, and
    ●     sources in the three participating states could shift emissions to
    unregulated sources.
    The arguments do not render the EPA’s determination arbitrary or
    capricious because states remain regulated under BART when they decline
    to participate in the 309 program. With continued regulation under BART,
    the EPA reasonably concluded that the 309 program could work effectively
    even without participation from heavy polluters. Joint App. at 29-30.
    The environmental groups challenge the factual basis for this
    conclusion because:
    ●     the 3 states generating the greatest emissions (Nevada,
    California, and Arizona) chose not to participate,
    ●     the 309 program excludes dozens of coal-fired power plants,
    ●     the 309 program encompasses only 15 coal-fired power plants,
    and
    ●     the participating states contribute only 36% of the sulfur-
    dioxide emissions over the Colorado Plateau.
    These factual arguments do not undermine the reasonableness of the
    EPA’s prediction. Notwithstanding exclusion of many heavy polluters, the
    EPA legitimately predicted that the 309 program would make “reasonable
    43
    progress” toward improvement of visibility over the Colorado Plateau. 
    Id. The excluded
    sources would still be regulated, though not under the 309
    program.
    The environmental groups counter that:
    ●     the exclusions prevent the 309 program from qualifying as a
    “regional” program, and
    ●     the existence of a regional program is necessary for the EPA to
    satisfy the statutory and regulatory purposes.
    Pet’rs’ Reply Br. at 46-47 (citing 42 U.S.C. § 7492(c)). We disagree.
    Section 7492 states that “[w]henever . . . the current or projected
    interstate transport of air pollutants from one or more States contributes
    significantly to visibility impairment in class I areas located in the affected
    States, the Administrator may establish a transport region for such
    pollutants that includes such States.” 42 U.S.C. § 7492(c)(1) (emphasis
    added). Accordingly, the statutory authorization of regional programs does
    not require a minimum number of participating states. See 
    id. The environmental
    groups also assert that exclusion of major coal-
    fired power plants from the nonparticipating states would lead sources in
    the three participating states to shift emissions to unregulated sources.
    Pet’rs’ Opening Br. at 51. To illustrate this assertion, the environmental
    groups refer to power plants owned by PacifiCorp. PacifiCorp could shift
    emissions from power plants in Wyoming and Utah (states participating in
    the 309 program) to power plants in Arizona and Colorado
    44
    (nonparticipating states). This shift would allow PacifiCorp to comply
    with the milestones established in the 309 program while increasing
    emissions in the nonparticipating states. According to the environmental
    groups, this shift would impede the overall reduction of emissions in the
    region and could even worsen visibility.
    As support, the environmental groups cite the EPA’s statements in
    the Clean Air Interstate Rule:
    Inclusion of all units substantially in the electricity sales
    business minimizes the potential for shifting utilization, and
    emissions, from regulated to unregulated units in that business
    and thereby freeing up allowances, with the result that total
    emissions from generation of electricity for sale exceed the
    [Clean Air Interstate Rule] emissions caps. The fact that units
    in the electricity sales business are generally interconnected
    through their access to the grid significantly increases the
    potential for utilization shifting.
    Final Rule, Rule to Reduce Interstate Transport of Fine Particulate Matter
    and Ozone (Clean Air Interstate Rule), 70 Fed. Reg. 25,162, 25,277 (May
    12, 2005) (emphasis added). 13
    13
    The D.C. Circuit Court of Appeals struck down the Clean Air
    Interstate Rule, reasoning that it violated the statutory prohibition against
    contribution of pollution in downwind states from sources within the
    upwind states. North Carolina v. EPA, 
    531 F.3d 896
    , 908 (D.C. Cir.
    2008); see North Carolina v. EPA, 
    550 F.3d 1176
    , 1178 (D.C. Cir. 2008)
    (en banc) (deciding to leave the Clean Air Interstate Rule in place until the
    EPA could promulgate additional regulations). The D.C. Circuit Court of
    Appeals reached this conclusion because the cap-and-trade program in the
    Clean Air Interstate Rule would not “assure that upwind states will abate
    their unlawful emissions as required by section 110(a)(2)(D)(i)(I).” North
    
    Carolina, 531 F.3d at 906
    . Essentially, the D.C. Circuit Court of Appeals
    agreed that upwind states participating in the regional trading program
    45
    The environmental groups overlook a vital distinction: Even when a
    state does not participate in the 309 program, it must comply with
    § 51.308. Accordingly, approval was not arbitrary or capricious based on
    the refusal of 6 states and 211 tribes to participate.
    4.    Inconsistency and a Lack of Explanation
    The environmental groups argue that the EPA changed its position
    regarding the “critical mass” of participating states without sufficient
    explanation. See Pet’rs’ Opening Br. at 53. We reject this argument.
    An unexplained deviation from past practice can render an agency’s
    decision arbitrary and capricious, but inconsistency with past practice “is
    not a basis for declining to analyze the agency’s interpretation[s].” Nat’l
    Cable & Telecomms. Ass’n v. Brand X Internet Servs., 
    545 U.S. 967
    , 981
    (2005). “[I]f the agency adequately explains the reasons for a reversal of
    policy, ‘change is not invalidating.’” 
    Id. (quoting Smiley
    v. Citibank
    (S.D.), N.A., 
    517 U.S. 735
    , 742 (1996)).
    The EPA never stated, one way or the other, whether a critical mass
    of participating states was necessary for the success of a 309 program.
    Instead, the EPA explicitly deferred to the judgment of the Western
    Regional Air Partnership, which did not make a recommendation on
    could trade emissions with other states to avoid the statutory duty to
    reduce emissions. 
    Id. Here, however,
    the environmental groups do not
    assert that shifting of emissions between sources would allow the
    participating states to avoid their statutory duties.
    46
    whether to require a minimum number of states. See 67 Fed. Reg. at
    30,427; Joint App. at 174-267. Because the EPA did not render an opinion
    on the critical-mass requirement, its approval of the 309 program was not
    arbitrary and capricious based on an alleged inconsistency with prior
    policy.
    C.     Emissions from the Escalante Coal Plant in New Mexico’s
    Implementation Plan
    The environmental groups also challenge the EPA’s approval of New
    Mexico’s implementation plan in areas beyond the Class I areas subject to
    the 309 program. In this challenge, the groups argue that the EPA did not
    account for emissions from the state’s second-largest non-BART coal
    plant, the Escalante coal plant. 42 U.S.C. § 7491(b)(2)(B); 40 C.F.R.
    § 51.308(d)(1), (3). We reject this argument.
    1.     Background
    The environmental groups’ argument requires examination of the
    regulatory and factual setting for New Mexico’s implementation plan.
    a.     Reasonable Progress Goals in § 51.308(d)(1)
    The regulations require states to establish reasonable progress goals
    through deciviews that would: (1) improve visibility during the most
    impaired days, and (2) ensure no degradation in visibility on the least
    impaired days. 40 C.F.R. § 51.308(d)(1). The related analysis involves
    two steps.
    47
    In the first step, states consider four factors:
    (1)    the cost of compliance;
    (2)    the time necessary for compliance;
    (3)    the energy and non-air quality environmental impacts of
    compliance; and
    (4)    the remaining useful life of any potentially affected
    sources.
    
    Id. § 51.308(d)(1)(i)(A).
    In the second step, states determine the rate of required progress by
    comparing the baseline visibility conditions to natural visibility conditions
    that are expected by 2064. 
    Id. § 51.308(d)(1)(i)(B).
    In this step, the state
    considers:
    ●      what progress is needed to obtain natural visibility conditions
    by 2064, and
    ●      what would be needed for the duration of the implementation
    plan.
    
    Id. If the
    state determines that it cannot reach the uniform rate of
    progress, it must demonstrate that a slower rate of progress is reasonable
    and that the greater rate of progress is unreasonable. 
    Id. § 51.308(d)(1)(ii).
    b.     New Mexico’s Reasonable Progress Goals
    In its plan, New Mexico applied the four-factor analysis and
    determined that the uniform rate of progress would not be reasonably
    48
    achievable. Final Rule, Approval and Promulgation of State
    Implementation Plans; New Mexico, 77 Fed. Reg. 70,693, 70,701-02 (Nov.
    27, 2012). This determination required the state to demonstrate that its
    slower rate of progress would be reasonable under the four-factor analysis
    articulated in § 51.308(d)(1)(i)(A). New Mexico complied with this
    requirement in part based on the Western Regional Air Partnership’s
    analysis.
    At New Mexico’s request, the Western Regional Air Partnership
    conducted an additional source-specific analysis of three petroleum
    refineries in New Mexico. Joint App. at 411. New Mexico used this
    source-specific analysis to argue that it could not achieve natural visibility
    conditions by 2064. 
    Id. at 564.
    To defend its less ambitious goal, New
    Mexico pointed to natural causes of pollution (such as local wildfires) and
    predicted improvement in visibility during the most impaired days and
    preservation of existing visibility on the best days. 
    Id. at 563-64.
    This reasoning prompted criticism. In response, New Mexico said it
    would “examine and consider implementing additional emission reductions
    in the [state implementation plan] analysis for 2013.” 
    Id. at 508.
    As
    promised, New Mexico analyzed emissions from additional power plants.
    
    Id. 49 c.
      The Escalante Coal Plant
    Though New Mexico expanded its analysis, it did not examine
    emissions at the Escalante Coal Plant. That omission gives rise to the
    present challenge.
    The Escalante Coal Plant is a 250-megawatt coal-fired power plant
    outside of Albuquerque, New Mexico. The environmental groups allege
    that the omission proves fatal because this plant “emits thousands of tons
    per year of haze-causing nitrogen oxides and is located within 200 miles of
    at least 5 of New Mexico’s Class I areas located outside of the Colorado
    Plateau.” Pet’rs’ Opening Br. at 57. The EPA counters that the Escalante
    plant’s emissions are far lower than the emissions from the only BART
    source in New Mexico (the San Juan Generating Station). Resp.’s Br. at 54
    n.13.
    2.   Waiver
    The EPA contends that the environmental groups did not exhaust this
    allegation because they did not cite § 51.308(d)(1), (3) or urge the need for
    analysis of the Escalante plant. Resp.’s Br. at 53-54. We disagree.
    In comments to the EPA, the environmental groups asserted:
    EPA’s proposal relies on the [Western Regional Air
    Partnership’s] general, non-source specific analysis of potential
    reasonable progress source categories. See, Docket EPA-R06-
    2009-0050-0014, Appendix E. The [Western Regional Air
    Partnership’s] general source category analysis fails to identify
    any specific New Mexico sources that may be subject to
    reasonable progress controls. 
    Id. The [Western
    Regional Air
    50
    Partnership’s] general source analysis is also factually
    incorrect.      Table 6-1 of the [Western Regional Air
    Partnership’s] analysis indicates that there is no [particulate
    matter, sulfur dioxide, or nitrogen oxide] emissions from coal
    fired boilers in New Mexico. 
    Id. at p.
    340. To the contrary,
    coal fired boilers at SJGS, Escalante coal plant, Raton coal
    plant, and Four Corners all emit significant quantities of these
    criteria pollutants. Thus, reliance on the [Western Regional
    Air Partnership] general source report for approval of the New
    Mexico [state implementation plan] is arbitrary and capricious
    due to its factual inaccuracy.
    Joint App. at 753.
    This comment put the EPA on notice of the current argument
    regarding the Escalante plant. As the EPA points out, the environmental
    groups did not argue that New Mexico was required to analyze the
    Escalante plant. But the comment alerted the EPA to the issue. See S.
    Coast Air Quality Mgmt. Dist. v. EPA, 
    472 F.3d 882
    , 891 (D.C. Cir. 2006)
    (“[C]ommenters must be given some leeway in developing their argument
    before this court, so long as the comment to the agency was adequate
    notification of the general substance of the complaint.”). The commenter
    was alleging a need to address emissions from all industrial sources in New
    Mexico, including the Escalante plant.
    The groups’ failure to cite § 51.308(d)(1), (3) is not fatal. The
    environmental groups discussed the reasonable progress goal, and this
    discussion provided “‘adequate notification of the general substance of the
    complaint.’” Natural Res. Def. Council v. EPA, 
    571 F.3d 1245
    , 1259 (D.C.
    Cir. 2009) (quoting S. Coast Air Quality Mgmt. 
    Dist., 472 F.3d at 891
    ).
    51
    3.    Consideration of the Escalante Plant
    Citing 40 C.F.R. § 51.308(d)(3)(iv), the environmental groups
    contend that New Mexico’s reasonable-progress analysis should have
    included an analysis of the Escalante plant 14 instead of relying solely on:
    (1) the Western Regional Air Partnership’s general, non-source specific
    analysis of potential controls for eight source categories, which did not
    include the Escalante plant, and (2) source-specific analyses for three New
    Mexico petroleum refineries.
    The environmental groups contend that New Mexico had “to
    undertake a ‘source-specific’ analysis to determine whether to require
    measures, such as installation of new air pollution control technology, to
    achieve the reasonable progress goals.” Pet’rs’ Opening Br. at 55. In
    support, the groups cite § 51.308(d)(1)(i)(A), the subsection outlining the
    four factors to be considered in the reasonable-progress analysis. See 40
    14
    In their opening brief, the environmental groups make a source-
    specific argument regarding the Escalante plant. See, e.g., Pet’rs’ Opening
    Br. at 54 (“EPA’s approval of the New Mexico [state implementation plan]
    also was arbitrary because New Mexico failed to evaluate whether
    emissions reductions from the Escalante coal plant were necessary to
    achieve reasonable progress.”). In their reply brief, however, the groups
    attempt to expand their argument, stating that New Mexico failed to
    properly consider all electric generating units (as a category) for non-309
    program Class I areas. See, e.g., Pet’rs’ Reply Br. at 56. This source-
    category argument was not raised in the environmental groups’ opening
    brief; thus, we will not consider this argument. See Silverton Snowmobile
    Club v. U.S. Forest Serv., 
    433 F.3d 772
    , 783 (10th Cir. 2006) (“[W]e have
    held that ‘[t]he failure to raise an issue in an opening brief waives that
    issue.’” (quoting Anderson v. U.S. Dep’t of Labor, 
    422 F.3d 1155
    , 1174
    (10th Cir. 2005))).
    52
    C.F.R. § 51.308(d)(1)(i)(A). As the EPA points out, however, this
    subsection does not require a source-specific analysis.
    Rather, the “source-specific” language originates in
    § 51.308(e)(2)(i)(C), which discusses the better-than-BART analysis. See
    40 C.F.R. § 51.308(e)(2)(i)(C). This subsection is distinct from the four
    factors in § 51.308(d)(1) that govern the determination of reasonable
    progress. Accordingly, we reject the environmental groups’ argument that
    the EPA had to engage in a source-specific analysis for a reasonable-
    progress determination. Nothing in the Regional Haze Rule or the Clean
    Air Act required New Mexico to conduct a four-factor analysis of the
    Escalante plant.
    Two parts of the Regional Haze Rule allowed New Mexico to rely on
    the Western Regional Air Partnership’s four-factor analysis. First,
    § 51.308(d)(3)(iii) permits a state conducting a reasonable-progress
    determination to “rely[] on technical analyses developed by the regional
    planning organization.” 40 C.F.R. § 51.308(d)(3)(iii). Second, § 51.309
    allows states to base determinations of reasonable progress “on
    assessments conducted by the States and/or a regional planning body.” 
    Id. § 51.309(g)(1).
    Under both subsections, New Mexico could base their
    determination of reasonable progress on the Western Regional Air
    Partnership’s assessments.
    53
    Neither the Clean Air Act nor the Regional Haze Rule requires
    source-specific analysis in the determination of reasonable progress. Thus,
    the EPA’s approval of New Mexico’s plan was not rendered arbitrary or
    capricious based on the alleged failure to conduct a four-factor analysis of
    the Escalante coal plant.
    IV.   Conclusion
    The EPA did not act arbitrarily or capriciously when it approved the
    participants’ implementation plans. Thus, we deny the petitions for
    review.
    54