Data / Federal rules / 2025-12526

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

The Environmental Protection Agency published this final rule in the Federal Register on July 8, 2025. It took effect on August 7, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is approving the Regional Haze State Implementation Plan (SIP) revision submitted by the Ohio Environmental Protection Agency (Ohio or Ohio EPA) on July 30, 2021, as supplemented on August 6, 2024, and clarified by Ohio on June 16, 2025, as satisfying applicable requirements under the Clean Air Act (CAA) and EPA's Regional Haze Rule for the program's second implementation period. Together, Ohio's 2021 SIP submission, 2024 SIP supplement, and 2025 clarification address the requirement that States must periodically revise their long-term strategies for making reasonable progress towards the national goal of preventing any future, and remedying any existing, anthropogenic impairment of visibility, including regional haze, in mandatory Class I Federal areas. Ohio's complete SIP submission also addresses other applicable requirements for the second implementation period of the Regional Haze Program. EPA is taking this action pursuant to sections 110 and 169A of the CAA.

Key facts

Document number: 2025-12526
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: July 8, 2025
Takes effect: August 7, 2025
Dates: This final rule is effective on August 7, 2025.
Docket: EPA-R05-OAR-2021-0544; FRL-12175-02-R5
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Environmental protection; Incorporation by reference; Intergovernmental relations; Nitrogen dioxide; Ozone; Particulate matter; Sulfur oxides
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 July 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.