Data / Federal rules / 2026-00003

Extension of the State Implementation Plan Due Date for the Regional Haze Third Implementation Period

The Environmental Protection Agency published this final rule in the Federal Register on January 6, 2026. It took effect on March 9, 2026.

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What the agency says

The Environmental Protection Agency (EPA) is finalizing revisions to the Regional Haze Rule (RHR) under the Clean Air Act (CAA) to change the due date for the next round of State Implementation Plans (SIPs) for the third implementation period from July 31, 2028, to July 31, 2031. Under the RHR, States must submit plans to protect visibility in mandatory Class I Federal areas to make reasonable progress towards the national goal of preventing any future, and remedying any existing, impairment of visibility in Class I areas.

Key facts

Document number: 2026-00003
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: January 6, 2026
Takes effect: March 9, 2026
Dates: This final rule is effective on March 9, 2026.
Docket: EPA-HQ-OAR-2023-0262; FRL-12160-02-OAR
Regulation ID (RIN): 2060-AW41
Code of Federal Regulations: 40 CFR 51
Topics: Administrative practice and procedure; Air pollution control; Environmental protection; Nitrogen dioxide; Particulate matter; Sulfur oxides; Transportation; Volatile organic compounds
Pages: 5

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on administrative practice and procedure · Rules on air pollution control · Rules on environmental protection · Published in January 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.