Data / Federal rules / 2025-17060

Extension of the Attainment Date of the Coachella Valley Extreme Nonattainment Area Under the 1997 Ozone National Ambient Air Quality Standards

The Environmental Protection Agency published this final rule in the Federal Register on September 5, 2025. It took effect on October 6, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is finalizing a one- year extension of the "Extreme" attainment date from June 15, 2024 to June 15, 2025, for the 1997 ozone national ambient air quality standards (NAAQS) to the Riverside County (Coachella Valley), California ozone nonattainment area ("Coachella Valley"). The EPA is also taking final action on the exceptional event request submitted by the California Air Resources Board (CARB) on October 11, 2024. This action is based on the EPA's concurrence on the exceptional events demonstration, which removed from the design value (DV) calculation the wildfire-influenced data recorded at the Palm Springs--Fire Station monitor (AQS Site ID #060655001) on July 14-15, 2023, and the extension request submitted by the State of California.

Key facts

Document number: 2025-17060
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: September 5, 2025
Takes effect: October 6, 2025
Dates: This rule is effective October 6, 2025.
Docket: EPA-R09-OAR-2024-0570; FRL-12518-02-R9
Code of Federal Regulations: 40 CFR 81
Topics: Air pollution control; Environmental protection; Nitrogen oxides; Ozone; Reporting and recordkeeping requirements; Volatile organic compounds
Pages: 7

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on air pollution control · Rules on environmental protection · Rules on nitrogen oxides · Published in September 2025

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.