SmogRank / World / United States / Pennsylvania / April 2023
Most polluted cities in Pennsylvania, United States, April 2023
26 cities in Pennsylvania, United States ranked by their average PM2.5 over the 30 days. Worst: New Holland at 14.5 µg/m³, #173 of 1,567 cities in the world. Cleanest: Hermitage at 7.3. A city needs measurements on 70% of the days to be ranked.
OpenAQ's archive, where our readings come from, has almost none for 3 of these 30 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.
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 Brighton 4%
- 2New Holland 0%
- 3Beaver Falls 0%
- 4West Mifflin 0%
- 5Harrisburg 0%
- 5Lancaster 0%
- 7Lebanon 0%
- 7Monessen 0%
- 9Schlusser 0%
- 10Erie 0%
- 11Philadelphia 0%
- 11Kennedy Township 0%
- 13York 0%
- 14State College 0%
- 15Pittsburgh 0%
- 15Wyomissing 0%
- 17Altoona 0%
- 18Scranton 0%
- 19Wilkinsburg 0%
- 20Johnstown 0%
- 21Bethlehem 0%
- 21Norristown 0%
- 23Kennett Square 0%
- 23Allentown 0%
- 25Jefferson Hills 0%
- 26Hermitage 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
All cities in the world, April 2023 · All cities in United States, April 2023 · Pennsylvania now
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SmogRank, most polluted cities in Pennsylvania, United States, PM2.5, April 2023, smogrank.com/us/region/pennsylvania/history/2023-04 (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.