SmogRank / World / United States / Pennsylvania / March 2026
Most polluted cities in Pennsylvania, United States, March 2026
33 cities in Pennsylvania, United States ranked by their average PM2.5 over the 31 days. Worst: Philadelphia at 10.4 µg/m³, #1,563 of 2,947 cities in the world. Cleanest: Warren at 5.4. 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%
- 2Abingtonlow-cost sensors 0%
- 3York 0%
- 4Monessen 0%
- 5Lebanon 0%
- 6Beaver Falls 0%
- 6Lancaster 0%
- 8West Mifflin 0%
- 9Hershey 0%
- 10Harrisburg 0%
- 10New Holland 0%
- 12Schlusser 0%
- 13New Brighton 0%
- 14Wyomissing 0%
- 15Norristown 0%
- 15Kennedy Township 0%
- 17Kennett Square 0%
- 18Wilkinsburg 0%
- 19Allentown 0%
- 19Johnstown 0%
- 19Pittsburgh 0%
- 22Natrona Heights 0%
- 23Erie 0%
- 24Canonsburg 0%
- 24State College 0%
- 26Scranton 0%
- 27Uniontown 0%
- 28Bridgeville 0%
- 28Greensburg 0%
- 28Hermitage 0%
- 28Jefferson Hills 0%
- 32Altoona 0%
- 33Warren 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, March 2026 · All cities in United States, March 2026 · Pennsylvania now
Use this board
SmogRank, most polluted cities in Pennsylvania, United States, PM2.5, March 2026, smogrank.com/us/region/pennsylvania/history/2026-03 (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.