SmogRank / World / United States / Illinois / February 2023
Most polluted cities in Illinois, United States, February 2023
12 cities in Illinois, United States ranked by their average PM2.5 over the 28 days. Worst: Calumet City at 9.3 µg/m³, #709 of 1,088 cities in the world. Cleanest: Springfield at 7.2. A city needs measurements on 70% of the days to be ranked.
OpenAQ's archive, where our readings come from, has almost none for 25 of these 28 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; many cities elsewhere are missing from this board, not clean. Why.
- 1Calumet City 51
- 2East Saint Louis 51
- 3Franklin Park 48
- 4Naperville 46
- 5Joliet 43
- 6Decatur 42
- 6Moline 42
- 6Rockford 42
- 9Cary 41
- 9Des Plaines 41
- 9Northbrook 41
- 12Springfield 40
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 2023 · All cities in United States, February 2023 · Illinois now
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SmogRank, most polluted cities in Illinois, United States, PM2.5, February 2023, smogrank.com/us/region/illinois/history/2023-02 (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.