Data / Federal rules / 2026-18748

Approval and Promulgation of Implementation Plans; California; San Joaquin Valley, Revisions to Motor Vehicle Emissions Budgets for Ozone

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

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What the agency says

The U.S. Environmental Protection Agency (EPA or "Agency") is taking final action to approve a revision to the State of California's state implementation plan (SIP) for the San Joaquin Valley (SJV) area. The revision includes an update to the SJV area's motor vehicle emissions budgets ("budgets") for nitrogen oxides (NO<INF>X</INF>) and volatile organic compounds (VOC) for the 2008 8- hour ozone national ambient air quality standards (NAAQS or "standards"). These updated budgets for 2026, 2029, and 2031 were developed with the latest modeling method approved for California. These updated budgets apply to all subareas within the SJV. Upon the effective date of this rule, the updated budgets will supersede the existing approved SJV subarea budgets for the 2008 ozone NAAQS that were based on an earlier emissions model. The EPA is approving the updated SJV ozone budgets in accordance with the requirements of the Clean Air Act (CAA or "Act") and the EPA's regulations.

Key facts

Document number: 2026-18748
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: September 14, 2026
Takes effect: October 14, 2026
Dates: This rule is effective October 14, 2026.
Docket: EPA-R09-OAR-2026-3400; FRL-13355-02-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: 5

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 September 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.