SmogRank / World / United States / Pennsylvania / January 2024
Most polluted cities in Pennsylvania, United States, January 2024
30 cities in Pennsylvania, United States ranked by their average PM2.5 over the 31 days. Worst: Bensalem at 12.8 µg/m³, #619 of 2,341 cities in the world. Cleanest: Uniontown at 5.4. 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.
- 1New Holland 3%
- 2Lancaster 3%
- 3Bensalem 0%
- 4Harrisburg 0%
- 5Schlusser 0%
- 6York 0%
- 7Lebanon 0%
- 8Philadelphia 0%
- 9Pittsburgh 0%
- 10Greensburg 0%
- 11Wyomissing 0%
- 12Canonsburg 0%
- 12Norristown 0%
- 14West Mifflin 0%
- 15Kennett Square 0%
- 16Bethlehem 0%
- 17Beaver Falls 0%
- 18Monessen 0%
- 19Allentown 0%
- 20State College 0%
- 21New Brighton 0%
- 21Scranton 0%
- 23Kennedy Township 0%
- 24Johnstown 0%
- 25Wilkinsburg 0%
- 26Jefferson Hills 0%
- 27Erie 0%
- 27Hermitage 0%
- 29Altoona 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
All cities in the world, January 2024 · All cities in United States, January 2024 · Pennsylvania now
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SmogRank, most polluted cities in Pennsylvania, United States, PM2.5, January 2024, smogrank.com/us/region/pennsylvania/history/2024-01 (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.