Data / Federal rules / 2026-20468

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

The Environmental Protection Agency published this proposed rule in the Federal Register on October 6, 2026. Comments are due by November 5, 2026.

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What the agency says

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<INF>2.5</INF>) National Ambient Air Quality Standard (NAAQS) (the 2024 annual PM<INF>2.5</INF> 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 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.

Key facts

Document number: 2026-20468
Type: Proposed rule
Action: Notice of availability; opportunity for public comment
Agency: Environmental Protection Agency
Published: October 6, 2026
Comments due: November 5, 2026
Dates: Comments must be received on or before November 5, 2026.
Docket: EPA-HQ-OAR-2024-0078; FRL-11650-03-OAR
Regulation ID (RIN): 2060-AW33
Code of Federal Regulations: 40 CFR 81
Pages: 4

The document on federalregister.gov PDF Comment on regulations.gov

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Everything from the Environmental Protection Agency · Published in October 2026

Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.