SmogRank / World / United States / Pennsylvania / August 2026
Most polluted cities in Pennsylvania, United States, August 2026
35 cities in Pennsylvania, United States ranked by their average PM2.5 over the 31 days. Worst: Philadelphia at 10.7 µg/m³, #743 of 2,866 cities in the world. Cleanest: Norristown at 5.8. 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.
- 1Philadelphia 0%
- 2Lancaster 0%
- 2Kennedy Township 0%
- 4York 0%
- 4West Mifflin 0%
- 6Hershey 0%
- 7Wilkinsburg 0%
- 8Beaver Falls 0%
- 8Pittsburgh 0%
- 10Natrona Heights 0%
- 11Lebanon 0%
- 12Chambersburg 0%
- 12Harrisburg 0%
- 12New Brighton 0%
- 15Johnstown 0%
- 16Bridgeville 0%
- 16Canonsburg 0%
- 18Greensburg 0%
- 18Jefferson Hills 0%
- 20Bensalem 0%
- 21Altoona 0%
- 21Scranton 0%
- 23Hermitage 0%
- 23State College 0%
- 25Uniontown 0%
- 26Allentown 0%
- 26Schlusser 0%
- 26Wyomissing 0%
- 29Kennett Square 0%
- 30Monessen 0%
- 31Warren 0%
- 32Bethlehem 0%
- 33New Holland 0%
- 34Erie 0%
- 35Norristown 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 2026, smogrank.com/us/region/pennsylvania/history/2026-08 (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.