EPA Declares Pennsylvania's Allegheny County Clean for 2012 PM2.5 Standards
Published Date: 4/16/2026
Rule
Summary
The EPA is officially declaring Allegheny County, Pennsylvania, clean enough to meet the 2012 air quality standards for tiny pollution particles called PM2.5. This means the area has improved its air and can now be treated as meeting federal health rules starting May 18, 2026. Residents and businesses can expect continued efforts to keep the air clean without new costly restrictions.
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Analyzed Economic Effects
3 provisions identified: 2 benefits, 0 costs, 1 mixed.
Allegheny County Redesigned to Attainment
The EPA has approved Pennsylvania’s request to change Allegheny County from nonattainment to attainment for the 2012 annual PM2.5 standard, and this redesignation is effective May 18, 2026. The EPA determined that ambient air monitoring data show the area now meets the 2012 annual PM2.5 national standard.
No New Federal Source Requirements From Redesignation
The EPA states that redesignating the Allegheny County Area to attainment does not impose any additional federal regulatory requirements on sources beyond those already required by Pennsylvania law. In other words, this redesignation itself does not add new federal limits on businesses' emissions.
Maintenance Plan Budgets Are Federally Enforceable
The EPA previously approved Pennsylvania’s maintenance plan for the Allegheny County Area, which included PM2.5 and NOX budgets for 2017, 2026, and 2035; that maintenance plan became federally enforceable on August 25, 2025. Those federally enforceable budgets and contingency provisions must be implemented by the Allegheny County Health Department (ACHD).
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