SmogRank / World / United States / Pennsylvania / September 2024
Most polluted cities in Pennsylvania, United States, September 2024
30 cities in Pennsylvania, United States ranked by their average PM2.5 over the 30 days. Worst: Hershey at 8.3 µg/m³, #725 of 1,964 cities in the world. Cleanest: Johnstown at 4.5. 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.
- 1Hershey 0%
- 2Harrisburg 0%
- 3Lebanon 0%
- 4Beaver Falls 0%
- 5New Holland 0%
- 6Philadelphia 0%
- 7Bensalem 0%
- 8West Mifflin 0%
- 9Lancaster 0%
- 9Scranton 0%
- 11Pittsburgh 0%
- 12Schlusser 0%
- 13Bethlehem 0%
- 13Greensburg 0%
- 15Norristown 0%
- 15Wyomissing 0%
- 15Kennedy Township 0%
- 18Allentown 0%
- 18New Brighton 0%
- 18Wilkinsburg 0%
- 21Kennett Square 0%
- 21York 0%
- 21Erie 0%
- 21Jefferson Hills 0%
- 21State College 0%
- 26Monessen 0%
- 27Altoona 0%
- 27Hermitage 0%
- 29Uniontown 0%
- 30Johnstown 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, September 2024, smogrank.com/us/region/pennsylvania/history/2024-09 (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.