# Air Plan Approval; Wyoming; R-35 Wyoming Air Quality Standards and Regulations Rule Package
> **Rule** · Direct final rule. · Published 2025-09-11 · Effective 2025-11-10 · 90 FR 43915
## Document
- **Document number:** 2025-17486
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 43915
- **CFR reference:** 40 CFR 52
- **Publication date:** 2025-09-11
- **Effective date:** 2025-11-10
- **State:** WY
- **EPA docket:** EPA-R08-OAR-2025-0204
## Abstract

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).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/09/11/2025-17486/air-plan-approval-wyoming-r-35-wyoming-air-quality-standards-and-regulations-rule-package)
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