SmogRank / World / United States / Pennsylvania / August 2023
Most polluted cities in Pennsylvania, United States, August 2023
30 cities in Pennsylvania, United States ranked by their average PM2.5 over the 31 days. Worst: West Mifflin at 12.7 µg/m³, #263 of 1,926 cities in the world. Cleanest: Wyomissing at 7.5. 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.
- 1West Mifflin 0%
- 2Bensalem 0%
- 3Pittsburgh 0%
- 4Beaver Falls 0%
- 5Wilkinsburg 0%
- 6Monessen 0%
- 7Philadelphia 0%
- 8Jefferson Hills 0%
- 8New Brighton 0%
- 10Greensburg 0%
- 10New Holland 0%
- 12Harrisburg 0%
- 12Johnstown 0%
- 14Kennedy Township 0%
- 15Erie 0%
- 16Uniontown 0%
- 17Lancaster 0%
- 18Canonsburg 0%
- 18Lebanon 0%
- 20Kennett Square 0%
- 20Hermitage 0%
- 22York 0%
- 23Altoona 0%
- 24Bethlehem 0%
- 25Norristown 0%
- 26Scranton 0%
- 27State College 0%
- 28Schlusser 0%
- 29Allentown 0%
- 30Wyomissing 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, August 2023, smogrank.com/us/region/pennsylvania/history/2023-08 (accessed 7 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.