SmogRank / World / United States / Illinois / November 2023
Most polluted cities in Illinois, United States, November 2023
22 cities in Illinois, United States ranked by their average PM2.5 over the 30 days. Worst: Granite City at 11.5 µg/m³, #337 of 2,194 cities in the world. Cleanest: Jerseyville at 6.8. 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.
- 1Granite City 0%
- 2East Saint Louis 0%
- 3Naperville 0%
- 4Oak Lawn 0%
- 4Rockford 0%
- 6Calumet City 0%
- 6Franklin Park 0%
- 6Joliet 0%
- 9Chicago 0%
- 10Peoria 0%
- 11Cary 0%
- 12Decatur 0%
- 13Des Plaines 0%
- 14Moline 0%
- 15Springfield 0%
- 15Wood River 0%
- 17Northbrook 0%
- 18Winthrop Harbor 0%
- 19Braidwood 0%
- 20Bloomington 0%
- 21Savoy 0%
- 22Jerseyville 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
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SmogRank, most polluted cities in Illinois, United States, PM2.5, November 2023, smogrank.com/us/region/illinois/history/2023-11 (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.