On October 16, 2024, the U.S. Supreme Court (SCOTUS) declined to put a hold on a Clean Air Act (CAA) regulation for New Source Performance Standards (NSPS) that went into effect on July 8, 2024.

On October 21, 2024, the U.S. Supreme Court (SCOTUS) agreed to hear several EPA-related cases to determine which federal courts are the proper venues for specific EPA actions.

The EPA recently published a proposed rule to add 16 per- and polyfluoroalkyl substances and 15 PFAS categories to the Toxics Release Inventory, which is a list of toxic chemicals subject to reporting under the Emergency Planning and Community Right-to-Know Act and the Pollution Prevention Act to comply with the National Defense Authorization Act for fiscal year 2020.

The EPA continues to crack down on the phasedown of hydrofluorocarbons. The Agency recently issued an enforcement alert, which provides information on common compliance issues observed with the importation of bulk HFCs and highlights recent civil and criminal enforcement actions.

The EPA took final action on a revision to the South Coast Air Quality Management District portion of the California state implementation plan (SIP). This revision concerns the regulation of nitrogen oxide emissions and particulate matter associated with warehouses as indirect sources that attract or may attract mobile source emissions.