Air Quality Plan; California; Mojave Desert Air Quality Management District; Replacing Outdated Requirements; Correction

What it does

On January 8, 2026, the EPA published a final rule in the Federal Register approving revisions to the California State Implementation Plan (SIP). In the final rule, the EPA included inaccurate amendatory instructions that prevented full incorporation of the final rule into the Code of Federal Regulations (CFR). This correction will ensure the revisions the EPA approved for the Mojave Desert Air Quality Management District's (MDAQD) portion of the California SIP are fully reflected in the CFR.

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

What changed in the regulation

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

40 CFR 52

Wording on eCFR: the day before it took effect and from the day it took effect (first part listed).

Compared with

The Environmental Protection Agency has published 245 final rules in 2026 so far, compared with 263 in all of 2025.

Counted by the Tribune from Federal Register records since Jan. 1, 2025.

What happens next and when

This action is effective on April 2, 2026.

The agency's dates, word for word.

Check it yourself

• The document in the Federal Register
• Docket EPA-R09-OAR-2024-0210 on Regulations.gov
• Title 40 on eCFR

The record as published

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