Data / Federal rules / 2025-08875

Air Plan Approval; California; Mojave Desert Air Quality Management District; Oxides of Nitrogen

The Environmental Protection Agency published this final rule in the Federal Register on May 19, 2025. It took effect on June 18, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the Mojave Desert Air Quality Management District (MDAQMD) portion of the California State Implementation Plan (SIP). This revision concerns emissions of oxides of nitrogen (NO<INF>X</INF>) from industrial, institutional, and commercial boilers, steam generators, and process heaters. We are approving a local rule that regulates these emission sources under the Clean Air Act (CAA or "Act").

Key facts

Document number: 2025-08875
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: May 19, 2025
Takes effect: June 18, 2025
Dates: This rule is effective June 18, 2025.
Docket: EPA-R09-OAR-2024-0563; FRL-12442-02-R9
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Carbon monoxide; Environmental protection; Incorporation by reference; Intergovernmental relations; Nitrogen oxides; Ozone; Particulate matter; Reporting and recordkeeping requirements
Pages: 2

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on air pollution control · Rules on carbon monoxide · Rules on environmental protection · Published in May 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.