Click here to return to EELP’s Regulatory Tracker. You can also find resources on the Biden administration on our Environmental Governance page. If you’re a reporter and would like to speak with an expert on this rule, please email us.
Why it Matters
The Obama Administration finalized more stringent ozone standards in 2015, which were set to take effect October 1, 2017. This action triggered EPA’s obligation to designate counties as either meeting the new standards (in attainment) or failing to meet them (non-attainment).
This page tracks EPA’s implementation of the 2015 ozone standards, EPA’s attainment designations, and challenges to those determinations.
For more information on the standards setting rulemakings, see our post, National Ambient Air Quality Standards for PM and Ozone.
States that are upwind affect downwind states’ ability to meet the NAAQS. For information on downwind air transport rulemakings, see our post: Air Transport – Cross-State Air Pollution Rule and Section 126 Petitions.
Environmental groups challenged EPA’s implementing regulations for the 2015 standard. The DC Circuit struck down three provisions in these rules, finding EPA’s interpretation of these elements were inconsistent with the CAA’s plain language, or unreasonable.
States and other interested parties have sued EPA for failing to make compliance determinations by the statutory deadline. For some areas for which EPA has issued attainment designations, states and environmental groups are challenging these designations. On May 24, 2021, the Biden EPA issued a final rule reversing designations in seven states in response to the DC Circuit’s July 10, 2020 ruling on such designations. EPA has also recently entered into several consent decrees to act on certain SIPs by specific dates related to the 2015 ozone standard.
Obama administrationRead More
Oct. 26, 2015 EPA issues a rule to tighten national ozone pollution standards based on the latest science. The new standards are set to take effect October 1, 2017.
Sep. 14, 2016 Murray Energy sues EPA challenging the new standards. Murray Energy Corp. v. EPA, Case No. 15-1385 (D.C. Cir.)
Nov. 17, 2016 EPA proposes nonattainment classification thresholds and compliance timelines for the 2015 rule.
Trump Era – Implementation Regulations for the 2015 Ozone NAAQSRead More
July 3, 2018 EPA sends the final draft of its implementation regulations for 2015 ground-level ozone standard to the White House Office of Management and Budget for review.
Dec. 6, 2018 EPA publishes a rule finalizing implementation requirements for the 2015 NAAQS. The final rule is effective on February 4, 2019.
Feb. 4, 2019 Environmental groups ask the DC Circuit to review EPA’s final implementation rule for the 2015 NAAQS. Downwinders at Risk v. EPA, 19-1024 (D.C. Cir.).
Sep. 23, 2019 EPA approves Texas’ State Implementation Plan.
Sep. 22, 2020 A three-judge panel of the DC Circuit holds oral arguments in Downwinders at Risk v. EPA, No. 19-1024.
Jan. 29, 2021 A three-judge panel for the U.S. Court of Appeals for the DC Circuit strikes down three parts of EPA’s 2015 and 2018 rules for implementing the ozone NAAQS. Specifically, the court strikes down the interprecursor trading program, which allowed emitters to use permitting offsets to comply with the NAAQs, and EPA’s interpretation of the CAA’s contingency measures requirements because both “contravene the statute’s unambiguous language.” The court also vacates EPA’s implementation of the milestone compliance demonstration requirements, which allowed states to demonstrate compliance showing “percentage implementation” instead of actual emissions reductions, because “it rests on an unreasonable interpretation of the statute.” Sierra Club v. EPA, No. 15-1465 (DC Cir.) (consolidated with Downwinders at Risk v. EPA, No. 19-1024).
Trump administration – DELAY IN ATTAINMENT DESIGNATIONSRead More
Oct. 1, 2017 Deadline for EPA to make all compliance determinations.
Nov. 16, 2017 EPA certifies some 2,650 areas as in compliance (or in attainment) of the rule. It does not designate any non-attainment areas or release a timeline for doing so, which is necessary to “start the clock for states to come up with cleanup plans.”
Dec. 4, 2017 A coalition of public health and environmental groups sue EPA for its delay of designating non-attainment areas.
Dec. 5, 2017 New York attorney general Eric T. Schneiderman announces 15 attorneys general sue EPA for its failure to designate non-attainment areas. Northern District of California, Case 3:17-cv-06936 (N.D.Cal.).
Dec. 19, 2017 The DC Circuit Court orders EPA to “file a status report identifying with precision and specificity when it plans to file a final rule establishing air quality designations” by January 12, 2018, for the areas that were not covered by the attainment designations made on November 16, 2017.
Dec. 22, 2017 EPA announces it sent letters to areas not covered by the attainment designations, seeking further information from them in order to make a designation, with a 120-day deadline for response.
Jan. 5, 2018 EPA publishes notice that it will make the remaining attainment designations by April 30, 2018.
Jan. 19, 2018 EPA files declarations with both the Northern District of California and DC Circuit stating it will make all remaining attainment designations by April 30, 2018, with the exception of eight counties in the San Antonio, TX area, which it will designate by August 10, 2018.
Feb. 7, 2018 A three-judge panel of the DC Circuit Court orders EPA to file a progress report by May 15, 2018 “detailing the status of all final designations for the 2015 ozone national ambient air quality standards.”
March 1, 2018 EPA issues a final rule setting the compliance timelines for areas in nonattainment and “establishing the air quality thresholds that define the classifications assigned to all nonattainment areas,” which were proposed in 2016 by the Obama EPA. The rule will take effect on May 8, 2018.
March 12, 2018 A Northern District of California District Court rules that EPA cannot delay the Texas counties, or any others, and must make all designations by July 17, 2018.
March 30, 2018 EPA publishes notice that it will finish designations for the Texas counties by the court-ordered deadline, and lists an intended designation for each area. The notice is open for public comment until April 30, 2018.
April 30, 2018 EPA announces it had made all remaining designations with the exception of the eight Texas counties. Fifty-one areas are in nonattainment, starting a clock for them to make improvements.
May 22, 2018 Fifteen states and the District of Columbia file a complaint with the US Circuit Court of Appeals for the DC Circuit, saying EPA had not listed its new ozone designations in the Federal Register. This listing is required to start the 60-day compliance clock. On May 24, 2018 a coalition of public health and environmental groups file in agreement with the states.
June 4, 2018 EPA publishes in the Federal Register designations for “all remaining areas, except for eight counties in the San Antonio, Texas metropolitan area,” starting a 60-day compliance clock for the designated areas.
July 17, 2018 EPA completes designations for the eight remaining counties in Texas that had not yet been designated. EPA designates Bexar County (where San Antonio, Texas is located) as a nonattainment area and the remaining seven counties as attainment/unclassifiable areas. The designations are posted in the Federal Register on July 25, 2018.
Jan. 2, 2019 the DC Circuit dismisses as moot American Lung Association v. EPA, No. 17-1172, regarding EPA’s delay in promulgating air quality designations.
March 25, 2019 WildEarth Guardians sue EPA for failing to determine whether the Denver area meets the 2008 ground level ozone standards of 75 parts-per-billion. WildEarth alleges that EPA was required to set the compliance status of the area by January 20, 2019. WildEarth Guardians v. Wheeler, No. 1:19-cv-00897 (D. Co.)
March 26, 2019 Colorado withdraws its request to extend the attainment date for the 2008 Ozone NAAQS for the Denver Metropolitan/North Front Range Nonattainment Area.
May 7, 2019 Sierra Club and Center for Biological Diversity sue EPA to force the agency to determine the Ozone NAAQs compliance status of Dallas-Fort Worth, Baltimore, Houston, Chicago, New York City, and seven other metropolitan areas. The groups allege that EPA has missed its January 20, 2019 deadline to determine whether these areas are in violation of the Ozone standards. This suit is similar to the March 25, 2019 WildEarth Guardians lawsuit. Center for Biological Diversity v. EPA, No. 3:19-cv-02462 (N.D. Cal.).
July 22, 2019 Judge Kane finds Administrator Wheeler failed to comply with his nondiscretionary duty to determine whether the Denver area should be downgraded to “serious nonattainment” with the 2008 Ozone NAAQs by January 20, 2019. Wheeler does not object to the finding, telling the court he has not yet made this determination. WildEarth Guardians v. Wheeler, No. 1:19-cv-00897 (D. Co.).
Dec. 11, 2019 the district court in Center for Biological Diversity v. EPA orders that EPA must finalize a determination for Imperial County, California by Feb. 13, 2020. EPA has issued determinations for the other counties at issue in the case. No. 3:19-cv-02462 (N.D. Cal.).
trump administration – CHALLENGES TO ATTAINMENT DESIGNATIONSRead More
Aug. 1, 2018 Clean Wisconsin files a suit challenging the attainment designations of counties in Wisconsin. Clean Wisconsin v. EPA, No. 18-1203 (D.C. Cir.).
Aug. 2, 2018 Illinois Attorney General Madigan and the City of Chicago files suit challenging attainment designations made for counties in Indiana, Illinois, and Wisconsin. Illinois v. EPA, No. 18-1208 (D.C. Cir.). Three lawsuits challenging designations have also been filed by environmental groups Sierra Club, Environmental Law & Policy Center, Respiratory Health Association, and the city of Sunland Park, NM, and Familias Unidas del Chamizal, an El Paso, TX.
Aug. 28, 2018 Texas Attorney General Paxton files suit challenging attainment designations made for Bexar County including the San Antonio area. Texas v. EPA, No. 18-60606 (5th Cir.).
July 10, 2020 The DC Circuit orders EPA to reconsider its 2015 ozone compliance designations in more than a dozen counties in Colorado, Illinois, Indiana, Michigan, Missouri, Texas, and Wisconsin. Clean Wisconsin v. EPA, No. 18-1203.
biden administrationRead More
May 24, 2021 EPA issues a final rule revising or reversing Trump-era designations for the 2015 ground-level ozone NAAQS in seven states. The rule is in response to a D.C. Circuit ruling sending the designations back to EPA. Clean Wisconsin v. EPA, No. 18-1203 (D.C. Cir.).
May 26, 2021 Environmental groups file an amended deadline suit against EPA for failing to issue “formal findings of failure” to New York, Pennsylvania, and Virginia, which have all exceeded the Clean Air Act’s six-month deadline to submit revised SIPs in compliance with the 2008 and 2015 ozone NAAQS. Center for Biological Diversity et al. v. Regan, No. 4:21-cv-02498 (N.D. Cal.).
July 23, 2021 EPA and environmental groups enter into a consent decree, which requires EPA, by specific dates, to approve or disapprove, in whole or in part, SIPs for Coachella Valley and Kern County, California as well as the Metro Denver area. Center for Biological Diversity et al v. Regan, Docket No. 3:20-cv-06020 (N.D. Cal.)
July 29, 2021 EPA published a notice of a proposed consent decree in State of New York, et al. v. Regan et al., No. 21 Civ. 252 (ALC) (S.D.N.Y.) with New York, Connecticut, Delaware, Massachusetts, and New Jersey, and the City of New York which would establish deadlines for EPA to act under the good neighbor provision of the Act to either approve or disapprove portions of six 2015 ozone NAAQS SIPs by Indiana, Kentucky, Michigan, Ohio, Texas, and West Virginia. Comments on the proposed consent decree are due by August 30, 2021.