In a significant decision for Clean Air Act enforcement, the U.S. District Court for the Eastern District of California held that citizens may pursue Clean Air Act claims against a state or local air agency in their regulatory capacity for allegedly failing to carry out State Implementation Plan (SIP) obligations. Read More »

Share | Email| Comments|  Topics: Agency Action, Air, California, Citizen Suit, Clean Air Act, Emissions, Hazardous Air Pollutants, Pollutants

In a recent decision by the United States Court of Appeals for the Sixth Circuit, Sierra Club v. EPA, Nos. 23-3581/3583 (6th Cir. Dec. 5, 2025), the Court invoked its statutory interpretation authority to hold that EPA contravened the plain language of the Clean Air Act (“CAA”) by redesignating the Detroit area as in attainment with the 2015 ozone National Ambient Air Quality Standards (“NAAQS”). Conversely, the Court deferred to EPA’s technical expertise in determining that certain air emissions should be excluded from consideration of the Detroit area’s compliance with the ozone NAAQS because of their qualification as “exceptional events” under the CAA, demonstrating that Courts will continue to defer to agencies’ expertise, but will not defer to agency interpretations of their enabling statutes. Read More »

Share | Email| Comments|  Topics: Agency Action, Air, Chevron Deference, Clean Air Act, Emissions, EPA, Hazardous Air Pollutants, Loper Bright, Michigan, Sixth Circuit

In the wake of the Supreme Court’s decision in Loper Bright Enters. v. Raimondo, 244 S.Ct. 2244 (2024), the general breadth and scope of agency decision-making has been called into question. In its recent decision, Huntsman Petrochemical LLC v. EPA, No. 23-1045, 2024 WL 3763355 (D.C. Cir. Aug. 13, 2024), the D.C. Circuit has made it clear that where statutory interpretation is not implicated, the Court will continue to afford EPA’s conclusions involving technical expertise a significant degree of deference. While neither the parties nor the Court attempted to address or reference Loper Bright, the Court articulated a clear standard applicable to agency actions involving statistical and modeling analyses: the Court will examine each step of an agency’s analysis to satisfy themselves that the agency has not “departed from a rational course.” Only where a statistical model “bears no rational relationship to the characteristics of data to which it was applied” will agency action be deemed arbitrary and capricious. Accordingly, regulated entities should be aware that the concept of deference lives on when challenging agency decision-making, even in the wake of the fall of Chevron Deference. Read More »

Share | Email| Comments|  Topics: Air, Chevron Deference, Clean Air Act, D.C. Circuit, Emissions, EPA, HAPs, Hazardous Air Pollutants, Rulemaking

On July 18, 2024, in Shirley v. Pennsylvania Legislative Reference Bureau, No. 85 MAP 2022, 2024 WL 3450536 (Pa. July 18, 2024), the Pennsylvania Supreme Court reversed the denial of three nonprofit organizations’ application to intervene in the litigation challenging the Pennsylvania Department of Environmental Protection (PADEP) regulation implementing Pennsylvania’s participation in the Regional Greenhouse Gas Initiative (the RGGI Regulation).  After rejecting several arguments regarding the appealability of the order denying intervention, the Court found that the nonprofits’ interest in defending the RGGI Regulation under the Pennsylvania Constitution’s Environmental Rights Amendment (ERA) was not adequately represented by the PADEP and therefore the lower court erred in denying intervention.  Because of this ruling, the three nonprofit organizations (Citizens for Pennsylvania’s Future, Clean Air Council, and the Sierra Club) (Nonprofits) are now able to pursue an appeal of the Commonwealth Court’s final order permanently enjoining the RGGI Regulation from going into effect.  Read More »

Share | Email| Comments|  Topics: Air, Clean Air Act, Environmental Rights Amendment, Greenhouse Gas, Hazardous Air Pollutants, Intervention, Pennsylvania, Pennsylvania Department of Environmental Protection, Rulemaking, Standing

On September 14, 2023, in Conservation Law Foundation v. Academy Bus, a Massachusetts District Court held that the members of the Conservation Law Foundation (the “Foundation”) lacked standing to challenge the idling of buses under the Clean Air Act (“CAA”).  Conservation Law Found. v. Acad. Express, LLC., No. 20-10032-WGY, 2023 WL 5984517, at *1 (D. Mass. Sept. 14, 2023). Specifically, the court held that simply breathing in polluted air, without any concrete injury that is fairly traceable to the defendant, is not sufficient to prove an actual injury under the CAA. Read More »

Share | Email| Comments|  Topics: Air, Citizens Suit, Clean Air Act, Emissions, HAPs, Hazardous Air Pollutants, Odors, Standing

On July 25, 2023, a Third Circuit panel rejected an environmental group’s challenge of federally approved changes to Pennsylvania’s State Implementation Plan (“SIP”), holding that the Environmental Protection Agency (“EPA”) emissions-based analysis did not violate the Clean Air Act (“CAA”). Ctr. for Biological Diversity v. U.S. Env’t Prot. Agency, 2023 WL 471884, at *6 (3d Cir. 2023). The panel’s reasoning focused on a close statutory reading of §7410 of the CAA, which prevents EPA from approving any SIP revision that would “interfere with any applicable requirement for attainment and reasonable further progress” in reaching the National Ambient Air Quality Standards (“NAAQS”). Id. at *4. NAAQS are air quality benchmarks that each state must work toward by reducing their air pollution levels. Id. at *1. Ultimately, the Third Circuit held that Pennsylvania’s revisions did not interfere with NAAQS attainment because Pennsylvania reasonably concluded that emissions would likely decrease under the source specific requirements imposed by the revised plan. Id. at *4. Read More »

Share | Email| Comments|  Topics: Air, Citizen Suit, Clean Air Act, Climate Change, Greenhouse Gas, HAPs, Hazardous Air Pollutants, Legislation, Pennsylvania, Rulemaking, Third Circuit

EPA’s Clean Air Act (“CAA”) rulemakings directed at power plants are often the target of regulatory challenges in federal court.  EPA’s latest rulemaking regulating Hazardous Air Pollutant (“HAP”) emissions from coal- and oil-fired electric utility steam generating units (“EGUs”) is unlikely to be an exception. 88 Fed. Reg. 13956 (Mar. 6, 2023).  In the now final rule, EPA has revoked an earlier action taken in 2020, in which the agency declined to regulate HAP emissions from EGUs after comparing the costs of compliance relative to the benefits of regulation, relying at the time on the Supreme Court’s decision in Michigan v. EPA, 576 U.S. 743 (2015).  Id. at 13957; see also 85 Fed. Reg. 31286. Now, just three years later under a new administration, the agency has backtracked, finding that it is appropriate and necessary to regulate HAP emissions from EGUs based on new data regarding the costs and benefits of regulating HAP emissions.  EPA claims that its latest decision is actually more in line with the statutory factors identified in Michigan for determining whether it is “appropriate and necessary” to regulate HAP emissions from EGUs under the CAA. Read More »

Share | Email| Comments|  Topics: Air, Clean Air Act, EPA, HAPs, Hazardous Air Pollutants, Rulemaking

In the recent decision of Cole v. Marathon Oil Corporation, Case No. 16-10642 (E.D. Mich. Oct. 25, 2016), a district court in the Eastern District of Michigan dismissed, in its entirety, a putative class action lawsuit against a refinery operated by the Marathon Oil Corporation (“Marathon”).  The court dismissed two of the complaint’s three common law claims as time-barred under Michigan law because the complaint failed to plead a “plausible” basis for the court to infer that the claims accrued within the limitations period, and the third cause of action, strict liability, was dismissed on the ground that it is not an independently-recognized cause of action in Michigan.  The decision suggests that, at least under Michigan law, plaintiffs in tort cases must allege more than mere ongoing harm when the allegations on the face of the complaint do not anticipate and provide a plausible basis to avoid an obvious, although unstated, statute of limitations problem. Read More »

Share | Email| Comments|  Topics: Air, Class Actions, Emissions, Hazardous Air Pollutants, Medical Monitoring, Michigan, Negligence, Nuisance, Statute of Limitations, Tolling, Toxic Torts

Last week, a federal court in the Central District of Illinois held the owner and operator of a coal-fired power plant liable for violations of the Clean Air Act for exceeding particulate matter emission thresholds in the plant’s state operating permit.  NRDC v. Ill. Power Res., LLC, No. 13-cv-1181, 2016 U.S. Dist. LEXIS 111976 (C.D. Ill. Aug. 23, 2016).  The court found that the plaintiffs—three environmental advocacy organizations who filed suit under the citizen suit provision of the CAA—had standing to sue the plant because certain of their individual members suffered injury-in-fact where emitted pollutants that “could cause harm” were present in the witnesses’ general geographic area and the witnesses’ pleasure was somehow diminished by the presence of the pollutants, even where the witnesses could not point to an objective effect of the alleged violation. Read More »

Share | Email| Comments|  Topics: Citizen Suit, Clean Air Act, Emissions, Federal Procedure, Hazardous Air Pollutants, Illinois, Permits, Standing

Several years ago we reported on Community Action & Environmental Justice v. Union Pacific Corporation, in which a California District Court held the dispersion into the air of particulate matter that reaches the ground or water did not constitute a “disposal” subject to RCRA but, instead, was subject to regulation under the Clean Air Act.  That District Court opinion was affirmed in 2014, in Community Action & Environmental Justice v. Union Pacific Corporation, 764 F.3d 1019 (9^th Cir. 2014).  Yesterday, in the case of Pakootas v. Teck Cominco Metals, No. 15-35228 (9^th Cir. July 27, 2016), the Ninth Circuit expanded this analysis of the relative roles of our environmental laws by holding that a party who disperses air pollutants that eventually settle into the ground or water are not arrangers liable under CERCLA as they have not “disposed of” hazardous substances under the Act. Read More »

Share | Email| Comments|  Topics: Air, Arranger Liability, Bona Fide Prospective Purchaser, California, CERCLA, Clean Air Act, Contamination, Decisions of Note, Emissions, Hazardous Air Pollutants, Ninth Circuit, RCRA, Superfund