SmogRank / World / United States / Pennsylvania / December 2023
Most polluted cities in Pennsylvania, United States, December 2023
30 cities in Pennsylvania, United States ranked by their average PM2.5 over the 31 days. Worst: Bensalem at 15.9 µg/m³, #258 of 2,197 cities in the world. Cleanest: Uniontown at 5.7. 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.
- 1Bensalem 10%
- 2Harrisburg 0%
- 3New Holland 0%
- 4Lebanon 0%
- 5Lancaster 0%
- 6Schlusser 0%
- 7Wyomissing 0%
- 8Philadelphia 0%
- 9York 0%
- 10Bethlehem 0%
- 11Greensburg 0%
- 11Norristown 0%
- 13Allentown 0%
- 13Pittsburgh 0%
- 15Beaver Falls 0%
- 16State College 0%
- 17Scranton 0%
- 17West Mifflin 0%
- 19Kennett Square 0%
- 20Johnstown 0%
- 21Altoona 0%
- 22New Brighton 0%
- 23Monessen 0%
- 24Kennedy Township 0%
- 25Hermitage 0%
- 26Wilkinsburg 0%
- 27Jefferson Hills 0%
- 28Erie 0%
- 29Canonsburg 0%
- 30Uniontown 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, December 2023, smogrank.com/us/region/pennsylvania/history/2023-12 (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.