Air Plan Approval; Pennsylvania; Redesignation Request for the Allegheny County Area for the 2012 Annual Fine Particulate Matter Standard
air-emissions · Rule · Published 2026-04-16 · Effective 2026-05-18 · PA · 91 FR 20369
Document
Document number
2026-07399
Federal Register citation
91 FR 20369
CFR reference
40 CFR 81
Type
Rule
Action
Final rule.
Category
air-emissions
Publication date
2026-04-16
Effective date
2026-05-18
State
PA
EPA docket
EPA-R03-OAR-2025-1777
Abstract
The Environmental Protection Agency (EPA) is approving the Commonwealth of Pennsylvania's request to redesignate the Allegheny County, Pennsylvania nonattainment area (Allegheny County Area) to attainment for the 2012 annual fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standards (NAAQS or standard). The redesignation request was submitted by the Commonwealth of Pennsylvania Department of Environmental Protection (PADEP or Pennsylvania) on behalf of the Allegheny County Health Department (ACHD). This action is being taken under the CAA.