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Proposed rule

Air Plan Approval; Pennsylvania; Redesignation Request for the Allegheny County Area for the 2012 Annual Fine Particulate Matter Standard

Environmental Protection Agency

Federal Register summary (shortened to 600 characters)

The Environmental Protection Agency (EPA) is proposing to approve a request from the Commonwealth of Pennsylvania to redesignate the Allegheny County, Pennsylvania nonattainment area (Allegheny County Area) to attainment for the 2012 annual fine particulate matter (PM2.5) national ambient air quality standard (NAAQS or standard). The EPA has already approved, as a revision to the Pennsylvania state implementation plan (SIP), a maintenance plan that demonstrates maintenance of the 2012 annual PM2.5 NAAQS through 2035 in the Allegheny County Area. The redesignation request was submitted by the…

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Document number
2025-20409
Published
Thu, Nov 20, 2025
Comments close
Mon, Dec 22, 2025Closed
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Oct 10, 2026, 10:00 PM