EPA Greenlights Cleaner Air for Pennsylvania's Allegheny County
Published Date: 11/20/2025
Proposed Rule
Summary
The EPA is planning to approve Pennsylvania’s request to officially recognize Allegheny County as meeting clean air standards for tiny pollution particles (PM2.5) from 2012. This means the area has improved air quality and will keep it clean through 2035, helping residents breathe easier. People can share their thoughts on this plan until December 22, 2025, but no big costs or changes are expected right now.
Analyzed Economic Effects
3 provisions identified: 2 benefits, 0 costs, 1 mixed.
Allegheny County Proposed Attainment
You live in Allegheny County, Pennsylvania, and the EPA is proposing to redesignate the county from nonattainment to attainment for the 2012 annual PM2.5 standard (12.0 micrograms per cubic meter). The EPA has approved a maintenance plan showing the county will continue to meet the 2012 annual PM2.5 standard through 2035 based on monitoring data for the 2022–2024 period; public comments are due December 22, 2025.
Permitting Program Shift on Redesignation
If the county is redesignated to attainment, the Allegheny County Health Department's Prevention of Significant Deterioration (PSD) program (Article XXI, section 2102.07) will become effective in the county upon redesignation. This changes which federal/state permitting rules apply to new or modified major stationary sources in the county.
Documented Emissions Reductions
You should know that Allegheny County reduced overall PM2.5 emissions by 24% from the 2011 base year to a 2017 control year, and SO2 emissions dropped by 67% over that period. The EPA attributes these reductions to permanent controls at major facilities (for example, controls at the USS Clairton plant) and several facility retirements, which helped the county meet the 2012 annual PM2.5 standard.
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Key Dates
Department and Agencies
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