SmogRank / World / United States / Pennsylvania / June 2026
Most polluted cities in Pennsylvania, United States, June 2026
34 cities in Pennsylvania, United States ranked by their average PM2.5 over the 30 days. Worst: Philadelphia at 9.0 µg/m³, #799 of 2,466 cities in the world. Cleanest: Altoona at 5.1. 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.
- 1Philadelphia 0%
- 2West Mifflin 0%
- 3York 0%
- 4Bensalem 0%
- 5Lancaster 0%
- 6Hershey 0%
- 6Kennedy Township 0%
- 8Lebanon 0%
- 9Harrisburg 0%
- 10Pittsburgh 0%
- 10Warren 0%
- 10Wilkinsburg 0%
- 13Norristown 0%
- 14Natrona Heights 0%
- 14Scranton 0%
- 16Wyomissing 0%
- 17Allentown 0%
- 17Beaver Falls 0%
- 19Kennett Square 0%
- 19Canonsburg 0%
- 19Jefferson Hills 0%
- 22Uniontown 0%
- 22Bethlehem 0%
- 22Greensburg 0%
- 25Bridgeville 0%
- 25Schlusser 0%
- 27Hermitage 0%
- 27New Brighton 0%
- 29Johnstown 0%
- 29New Holland 0%
- 31State College 0%
- 32Erie 0%
- 32Monessen 0%
- 34Altoona 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, June 2026, smogrank.com/us/region/pennsylvania/history/2026-06 (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.