Initial Air Quality Designations for the 2024 Revised Primary Annual Fine Particle (PM2.5) National Ambient Air Quality Standards (NAAQS)

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Environmental Protection Agency 40 CFR Part 81 [EPA-HQ-OAR-2024-0078; FRL-11650-03-OAR] RIN 2060-AW33 AGENCY: Environmental Protection Agency (EPA). ACTION: Notice of availability; opportunity for public comment. SUMMARY: The U.S. Environmental Protection Agency (EPA) is providing notice of the Agency's intended approach for area designations for the 2024 primary annual fine particulate matter (PM 2.5 ) National Ambient Air Quality Standard (NAAQS) (the 2024 annual PM 2.5 NAAQS) under Clean Air Act (CAA) section 107(d). Details regarding these designations, as well as the EPA's notifications to States, territories, and Tribes regarding their initial area designations are accessible via the Agency's website and public electronic docket. With this notice, the EPA is providing an opportunity for public comment on its intended approach for finalizing area designations during the comment period ( printed page 63517) specified in the DATES section. The EPA sent notifications directly to applicable States, territories, and Tribes regarding their initial area designations on or about October 2, 2026, and anticipates promulgating final designations consistent with CAA requirements. DATES: Comments must be received on or before November 5, 2026. ADDRESSES: You may send comments, identified by Docket ID No. EPA-HQ-OAR-2024-0078, by any of the following methods: Federal eRulemaking Portal: https://www.regulations.gov (the EPA's preferred method). Follow the online instructions for submit…