SmogRank / World / United States / Pennsylvania / 2025
Most polluted cities in Pennsylvania, United States, 2025
31 cities in Pennsylvania, United States ranked by their average PM2.5 over the 365 days; 31 above the WHO annual guideline (5.0 µg/m³). Worst: Beaver Falls at 9.4 µg/m³, #1,155 of 2,624 cities in the world. Cleanest: Canonsburg at 6.1. 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.
- 1Scranton 1%
- 2York 1%
- 3Erie 0%
- 4Hermitage 0%
- 5Beaver Falls 0%
- 6Kennett Square 0%
- 7West Mifflin 0%
- 8New Holland 0%
- 9Lebanon 0%
- 10Philadelphia 0%
- 10Harrisburg 0%
- 10Lancaster 0%
- 13Bensalem 0%
- 13Hershey 0%
- 13Kennedy Township 0%
- 16Pittsburgh 0%
- 16Schlusser 0%
- 18Wilkinsburg 0%
- 19Wyomissing 0%
- 20Jefferson Hills 0%
- 20New Brighton 0%
- 22Norristown 0%
- 23Monessen 0%
- 24Altoona 0%
- 24Bethlehem 0%
- 26Greensburg 0%
- 27Uniontown 0%
- 27Allentown 0%
- 27Johnstown 0%
- 27State College 0%
- 31Canonsburg 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, 2025, smogrank.com/us/region/pennsylvania/history/2025 (accessed 6 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.