SmogRank / World / United States / Pennsylvania / February 2026
Most polluted cities in Pennsylvania, United States, February 2026
34 cities in Pennsylvania, United States ranked by their average PM2.5 over the 28 days. Worst: New Holland at 19.8 µg/m³, #567 of 2,841 cities in the world. Cleanest: Bridgeville at 8.3. 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 12%
- 2Hershey 4%
- 3Lebanon 4%
- 4York 4%
- 5Lancaster 4%
- 6Schlusser 4%
- 7Wyomissing 4%
- 8Harrisburg 4%
- 9Abingtonlow-cost sensors 0%
- 10Philadelphia 0%
- 11Beaver Falls 0%
- 11West Mifflin 0%
- 13Bethlehem 0%
- 14Norristown 0%
- 15Kennett Square 0%
- 15Allentown 0%
- 17New Brighton 0%
- 17State College 0%
- 17Kennedy Township 0%
- 20Johnstown 0%
- 21Scranton 0%
- 22Wilkinsburg 0%
- 23Erie 0%
- 24Monessen 0%
- 24Pittsburgh 0%
- 26Altoona 0%
- 26Natrona Heights 0%
- 28Jefferson Hills 0%
- 29Greensburg 0%
- 30Hermitage 0%
- 31Canonsburg 0%
- 32Warren 0%
- 33Uniontown 0%
- 34Bridgeville 0%
Low-cost sensors: consumer units, counted only in cities with no government-grade monitor; they read close to reference monitors on the whole, but 15 to 25% high in humid air. How we use them.
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, February 2026 · All cities in United States, February 2026 · Pennsylvania now
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SmogRank, most polluted cities in Pennsylvania, United States, PM2.5, February 2026, smogrank.com/us/region/pennsylvania/history/2026-02 (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.