SmogRank / World / United States / Pennsylvania / September 2023
Most polluted cities in Pennsylvania, United States, September 2023
29 cities in Pennsylvania, United States ranked by their average PM2.5 over the 30 days. Worst: Bensalem at 11.0 µg/m³, #405 of 2,128 cities in the world. Cleanest: Hermitage at 5.3. 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 0%
- 2Philadelphia 0%
- 3West Mifflin 0%
- 4New Holland 0%
- 5Beaver Falls 0%
- 6Harrisburg 0%
- 6Pittsburgh 0%
- 8York 0%
- 9Jefferson Hills 0%
- 9Scranton 0%
- 11Lancaster 0%
- 12Wilkinsburg 0%
- 13Lebanon 0%
- 14Bethlehem 0%
- 14Greensburg 0%
- 16Uniontown 0%
- 17New Brighton 0%
- 18Erie 0%
- 18Monessen 0%
- 20Kennett Square 0%
- 21Altoona 0%
- 21Canonsburg 0%
- 21Norristown 0%
- 24Allentown 0%
- 24Kennedy Township 0%
- 26Wyomissing 0%
- 27Schlusser 0%
- 28State College 0%
- 29Hermitage 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 2023, smogrank.com/us/region/pennsylvania/history/2023-09 (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.