Data / Federal rules / 2025-17054

Air Plan Approval; ID; Regional Haze Plan for the Second Implementation Period

The Environmental Protection Agency published this final rule in the Federal Register on September 5, 2025. It took effect on October 6, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is approving the Idaho regional haze State Implementation Plan (SIP) revision submitted on August 5, 2022, supplemented on September 27, 2024, and clarified on August 12, 2025, as satisfying applicable requirements under the Clean Air Act and the EPA's Regional Haze Rule (RHR) for the program's second implementation period. The Idaho SIP revision addressed the requirement to make reasonable progress toward the national goal of preventing any future, and remedying any existing, anthropogenic impairment of visibility in certain national parks and wilderness areas.

Key facts

Document number: 2025-17054
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: September 5, 2025
Takes effect: October 6, 2025
Dates: This final rule is effective October 6, 2025.
Docket: EPA-R10-OAR-2024-0545; FRL-11879-02-R10
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Environmental protection; Incorporation by reference; Intergovernmental relations; Ozone; Particulate matter; Reporting and recordkeeping requirements; Sulfur oxides; Volatile organic compounds
Pages: 9

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 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.