SmogRank / World / United States / Pennsylvania / July 2026
Most polluted cities in Pennsylvania, United States, July 2026
35 cities in Pennsylvania, United States ranked by their average PM2.5 over the 31 days. Worst: Kennedy Township at 23.5 µg/m³, #243 of 2,751 cities in the world. Cleanest: Allentown at 13.1. 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.
- 1Beaver Falls 13%
- 2New Brighton 13%
- 3Bridgeville 11%
- 4York 10%
- 5Erie 10%
- 5Lancaster 10%
- 7Uniontown 10%
- 8Harrisburg 10%
- 9Chambersburg 10%
- 9Schlusser 10%
- 11Greensburg 10%
- 12Kennedy Township 10%
- 13West Mifflin 10%
- 14Philadelphia 10%
- 15Pittsburgh 10%
- 16Natrona Heights 10%
- 17Wilkinsburg 10%
- 18Lebanon 10%
- 19Johnstown 10%
- 20Warren 10%
- 21Canonsburg 10%
- 22State College 10%
- 23Hermitage 10%
- 24Jefferson Hills 10%
- 25Altoona 10%
- 26Monessen 10%
- 27Norristown 10%
- 28Wyomissing 10%
- 29Bensalem 10%
- 30Bethlehem 10%
- 30New Holland 10%
- 32Kennett Square 10%
- 33Scranton 10%
- 34Allentown 7%
- 35Hershey 3%
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, July 2026, smogrank.com/us/region/pennsylvania/history/2026-07 (accessed 6 Oct 2026).
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