Proposed Rules. Proposed rule

Agency: Environmental Protection Agency (EPA)
Action: Proposed rule
Citation: FR Doc. 2025-17488 · EPA-R08-OAR-2025-0204; FRL-12942-01-R8 · 40 CFR 52

Summary

The Environmental Protection Agency (EPA) is proposing 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 EPA approve the revisions 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. These revisions do not change the intent or scope of each rule. The EPA is proposing approval of these SIP revisions because we have determined that they are in accordance with the requirements for SIP provisions under the Clean Air Act (CAA or the Act). The proposed approval of WAQSR Chapter 2, section 4 of the December 16, 2024 submittal supersedes the revisions to this section contained in WDEQ's February 10, 2014 SIP submittal that the EPA had not previously acted on. In the “Rules and Regulations” section of this Federal Register , we are approving these SIP revisions as a direct final rule without a prior proposed rule. If we receive no adverse comment, we will not take further action on this proposed rule.

Dates

Written comments must be received on or before October 14, 2025.

Supplementary Information

This document proposes to approve revisions to the Wyoming SIP that improve readability and incorporate updated Code of Federal Regulations weblinks to the WAQSR. We have published a direct final rule approving those revisions in the Rules and Regulations section of this Federal Register . EPA is approving the state's submittal as a direct final rule without prior proposal because we view this as a noncontroversial action and anticipate no adverse comment. We have explained our reasons for this action in the preamble to the direct final rule. If we receive no relevant adverse comment, we will not take further action on this proposed rule. If we receive adverse comment, we will withdraw the direct final rule, and it will not take effect. We would address all public comments in any subsequent final rule based on this proposed rule. We do not intend to institute a second comment period on this action. Any parties interested in commenting must do so at this time. For further information, please see the information provided in the ADDRESSES section of this document. Dated: August 29, 2025. Cyrus M. Western, Regional Administrator, EPA Region 8. [FR Doc. 2025-17488 Filed 9-10-25; 8:45 am]