Data / Federal rules / 2025-16466

Air Plan Approval; California; Mojave Desert Air Quality Management District; Internal Combustion Engines

The Environmental Protection Agency published this final rule in the Federal Register on August 28, 2025. It took effect on September 29, 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 volatile organic compounds (VOCs) and oxides of nitrogen (NO<INF>X</INF>) from internal combustion engines. We are approving a local rule that regulates these emission sources under the Clean Air Act (CAA or the "Act"). The EPA is also making additional administrative updates to the MDAQMD portion of the California SIP by correcting text in the Code of Federal Regulations.

Key facts

Document number: 2025-16466
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: August 28, 2025
Takes effect: September 29, 2025
Dates: This rule is effective September 29, 2025.
Docket: EPA-R09-OAR-2023-0202; FRL-10873-02-R9
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Carbon monoxide; Environmental protection; Incorporation by reference; Intergovernmental relations; Nitrogen oxides; Ozone; 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 carbon monoxide · Rules on environmental protection · Published in August 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.