Data / Federal rules / 2026-16511

Determination of Attainment by the Attainment Date; 1997 Ozone Standards; California; Coachella Valley

The Environmental Protection Agency published this final rule in the Federal Register on August 13, 2026. It took effect on September 14, 2026.

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What the agency says

The Environmental Protection Agency (EPA) is taking final action to determine that the Riverside County (Coachella Valley), CA 1997 ozone "Extreme" nonattainment area attained the revoked 1997 ozone national ambient air quality standards (NAAQS) by its June 15, 2025 attainment date. This determination is based on quality-assured and certified ambient air quality monitoring data from 2022 through 2024.

Key facts

Document number: 2026-16511
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: August 13, 2026
Takes effect: September 14, 2026
Dates: This rule is effective September 14, 2026.
Docket: EPA-R09-OAR-2025-3127; FRL-13098-02-R9
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Environmental protection; Incorporation by reference; Intergovernmental relations; Nitrogen oxides; Ozone; Reporting and recordkeeping requirements; Volatile organic compounds
Pages: 3

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 incorporation by reference · Published in August 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.