Data / Federal rules / 2025-17486

Air Plan Approval; Wyoming; R-35 Wyoming Air Quality Standards and Regulations Rule Package

The Environmental Protection Agency published this final rule in the Federal Register on September 11, 2025. It took effect on November 10, 2025. Comments closed on October 14, 2025.

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What the agency says

The Environmental Protection Agency (EPA) is taking direct final action to approve revisions to the Wyoming State Implementation Plan (SIP) submitted by the Wyoming Department of Environmental Quality (WDEQ) on December 16, 2024. WDEQ requested the EPA approve the revised rules for Chapters 2, 3, 4, 8, and 14 in the Wyoming Air Quality Standards and Regulations (WAQSR). The revised rules include non- substantive updates to rule language that ensure consistent grammar, formatting, and written clarity as well as updated references to the Code of Federal Regulations (CFR). The EPA is taking this action pursuant to the Clean Air Act (CAA).

Key facts

Document number: 2025-17486
Type: Final rule
Action: Direct final rule
Agency: Environmental Protection Agency
Published: September 11, 2025
Takes effect: November 10, 2025
Comments due: October 14, 2025
Dates: This direct final rule is effective on November 10, 2025, without further notice, unless the EPA receives adverse comments by October 14, 2025. If adverse comments are received, the EPA will publish a timely withdrawal of the direct final rule in the Federal Register informing the public that the rule will not take effect.
Docket: EPA-R08-OAR-2025-0204; FRL-12942-02-R8
Code of Federal Regulations: 40 CFR 52
Topics: Air pollution control; Carbon monoxide; Environmental protection; Greenhouse gases; Incorporation by reference; Intergovernmental relations; Lead; Nitrogen dioxide; Ozone; Particulate matter; Reporting and recordkeeping requirements; Sulfur oxides; Volatile organic compounds
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 carbon monoxide · Rules on environmental protection · Published in September 2025

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