SmogRank / World / United States / Pennsylvania / June 2023

Most polluted cities in Pennsylvania, United States, June 2023

27 cities in Pennsylvania, United States ranked by their average PM2.5 over the 30 days. Worst: New Holland at 38.8 µg/m³, #37 of 1,549 cities in the world. Cleanest: Philadelphia at 19.6. 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.

← New Holland 27% 20%0

Every city in Pennsylvania, United States ranked for June 2023, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.

1New Holland
27%
2Beaver Falls
23%
3State College
22%
4Altoona
21%
5Harrisburg
21%
6Lancaster
21%
7Lebanon
20%
8York
20%
9Schlusser
20%
10Monessen
20%
11Scranton
18%
12Wilkinsburg
17%
13Bethlehem
17%
14Wyomissing
17%
15Allentown
17%
15Norristown
17%
17Kennett Square
17%
18Erie
17%
19Pittsburgh
13%
20West Mifflin
13%
21Kennedy Township
13%
22New Brighton
12%
23Bensalem
11%
24Philadelphia
11%
25Hermitage
10%
26Jefferson Hills
10%
27Johnstown
10%

Good0–50

Moderate51–100

Sensitive groups101–150

Unhealthy151–200

Very unhealthy201–300

Hazardous301+

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 2023, smogrank.com/us/region/pennsylvania/history/2023-06 (accessed 7 Oct 2026).

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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.