SmogRank / World / United States / Pennsylvania / March 2025
Most polluted cities in Pennsylvania, United States, March 2025
31 cities in Pennsylvania, United States ranked by their average PM2.5 over the 31 days. Worst: Beaver Falls at 9.0 µg/m³, #1,755 of 2,809 cities in the world. Cleanest: Hermitage at 5.6. A city needs measurements on 70% of the days to be ranked.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
- 1Beaver Falls 0%
- 2West Mifflin 0%
- 3Lebanon 0%
- 4Harrisburg 0%
- 4New Holland 0%
- 6Philadelphia 0%
- 6Schlusser 0%
- 8Hershey 0%
- 9Wyomissing 0%
- 10Lancaster 0%
- 11Kennett Square 0%
- 11Bensalem 0%
- 13New Brighton 0%
- 13Wilkinsburg 0%
- 13Kennedy Township 0%
- 16York 0%
- 16Johnstown 0%
- 16Pittsburgh 0%
- 19Altoona 0%
- 20State College 0%
- 21Bethlehem 0%
- 21Scranton 0%
- 23Jefferson Hills 0%
- 23Monessen 0%
- 23Norristown 0%
- 26Uniontown 0%
- 26Allentown 0%
- 26Greensburg 0%
- 29Erie 0%
- 30Canonsburg 0%
- 30Hermitage 0%
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
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SmogRank, most polluted cities in Pennsylvania, United States, PM2.5, March 2025, smogrank.com/us/region/pennsylvania/history/2025-03 (accessed 6 Oct 2026).
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