Regulatory Tracker National Ambient Air Quality Standards (NAAQS) for Particulate Matter (PM) The CAA requires EPA to review and set primary and secondary standards for PM NAAQS every 5 years. The Biden EPA strengthened the standard in March 2024. June 26, 2026
Regulatory Tracker Clean Car Rules — Corporate Average Fuel Economy Standards/Greenhouse Gas Standards The EPA rescinded the Endangerment Finding and all GHG vehicle standards. June 22, 2026
Environmental Justice Tracker Several Federal Agencies Eliminated Their Disparate Impact Regulations June 17, 2026
Regulatory Tracker National Ambient Air Quality Standards (NAAQS) for Ozone On March 12, 2025, EPA announced a reconsideration of the NAAQS. June 9, 2026
Regulatory Tracker EPA VOC and Methane Standards for Oil and Gas Facilities The Biden EPA finalized three rules regulating methane emissions from the oil and gas sector. One of the rules, the Waste Emission Charge, was repealed using the Congressional Review Act. In Sept. 2025, EPA proposed to delay the GHG reporting rules until 2034. In Nov. 2025, EPA finalized the deadline exemptions for certain provisions regulating methane emissions from new and existing oil and gas sources. June 8, 2026
Regulatory Tracker Coal Ash Rule EPA announced a final rule to delay deadlines for coal ash regulations. June 5, 2026
Regulatory Tracker Regional Haze Rule Through two state plan approvals, EPA finalized a new policy that eases all states’ Regional Haze planning obligations. Environmental groups are challenging the approvals. June 5, 2026
Environmental Justice Tracker EPA Set New Emission Standards for Hazardous Waste Combustors June 3, 2026
Regulatory Tracker Hydrofluorocarbons and the Kigali Amendment to the Montreal Protocol In 2022, the U.S. Senate ratified the Kigali Amendment, which committed the U.S. to reducing the use of HFCs. EPA issued multiple rules to implement the mandate. In Oct. 2025, EPA issued a proposed rule to loosen requirements and compliance deadlines for air conditioning, retail food refrigeration, and other sectors. May 26, 2026
