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

What it does

The Environmental Protection Agency (EPA) is proposing to approve revisions to the State of California's State Implementation Plan (SIP) for the San Joaquin Valley (SJV) area. The revisions consist of 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 standard (NAAQS or "standard"). 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 SJV. If the EPA approves these budgets, they would supersede the existing approved SJV subarea budgets for the 2008 ozone NAAQS that were based on an earlier emissions model. The EPA is proposing to approve the updated SJV ozone budgets in accordance with the requirements of the Clean Air Act (CAA or "Act") and the EPA's regulations.

The Environmental Protection Agency's summary, as published in the Federal Register.

What it would change

1 part of Title 40 of the Code of Federal Regulations:

40 CFR 52

What happens next and when

Written comments must arrive on or before August 10, 2026.

The agency's dates, word for word.

Check it yourself

• The document in the Federal Register
• Docket EPA-R09-OAR-2026-3400 on Regulations.gov
• Title 40 on eCFR

The record as published

Source: the Federal Register (public domain). The document in the Federal Register