Air Plan Approval; Pennsylvania; Redesignation of the Warren County Nonattainment Area to Attainment and Approval of the Area's Maintenance Plan for the 2010 1-Hour Primary Sulfur Dioxide National Ambient Air Quality Standard

What it does

The Environmental Protection Agency (EPA) is proposing to approve a state implementation plan (SIP) revision and redesignation request submitted on September 19, 2025 by the Pennsylvania Department of Environmental Protection (PADEP). The SIP revision asks the EPA to redesignate the Warren County, Pennsylvania area from nonattainment to attainment for the 2010 1-hour primary sulfur dioxide (SO<INF>2</INF>) national ambient air quality standard (NAAQS). The revision also asks the EPA to approve into the SIP the Commonwealth's maintenance plan for the 2010 1-hour primary SO<INF>2</INF> NAAQS for the Warren County area. Furthermore, Pennsylvania requests that the EPA correct source- specific requirements for United Refining Company within the Pennsylvania SIP that were previously included in error. This proposed action is being taken under the Clean Air Act (CAA).

The Environmental Protection Agency's summary, as published in the Federal Register.

What it would change

2 parts of Title 40 of the Code of Federal Regulations:

40 CFR 52, 40 CFR 81

What happens next and when

Written comments must be received on or before August 31, 2026.

The agency's dates, word for word.

Check it yourself

• The document in the Federal Register
• Docket EPA-R03-OAR-2026-1685 on Regulations.gov
• Title 40 on eCFR

The record as published

Source: the Federal Register (public domain). The document in the Federal Register