Data / Federal rules / 2025-09997

Clean Data Determination and Approval of Base Year Emissions Inventory; California; Los Angeles-South Coast Air Basin; 189(d) Plan for the 2006 24-Hour PM2.5 NAAQS

The Environmental Protection Agency published this final rule in the Federal Register on June 3, 2025. It took effect on July 3, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is making a clean data determination (CDD) for the Los Angeles-South Coast Air Basin ("South Coast") air quality planning area in California based on our determination that the area is attaining the 2006 24-hour fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standards (NAAQS). As a result of this CDD, certain Clean Air Act (CAA) requirements that have applied to California will be suspended for so long as the area continues to meet the 2006 24-hour PM<INF>2.5</INF> NAAQS. The EPA is also approving a revision to California's state implementation plan (SIP) consisting of the 2018 base year emissions inventory for the South Coast PM<INF>2.5</INF> nonattainment area, submitted by the California Air Resources Board (CARB) on December 29, 2020.

Key facts

Document number: 2025-09997
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: June 3, 2025
Takes effect: July 3, 2025
Dates: his rule is effective July 3, 2025.
Docket: EPA-R09-OAR-2024-0472; FRL-12322-02-R9
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Ammonia; Environmental protection; Incorporation by reference; Intergovernmental relations; Nitrogen oxides; Particulate matter; Reporting and recordkeeping requirements; Sulfur oxides; 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 ammonia · Rules on environmental protection · Published in June 2025

Read from the Federal Register API, last updated 2026-10-24. 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.