SmogRank / World / United States / Illinois / December 2024
Most polluted cities in Illinois, United States, December 2024
28 cities in Illinois, United States ranked by their average PM2.5 over the 31 days. Worst: Oak Lawn at 10.5 µg/m³, #817 of 2,573 cities in the world. Cleanest: Jerseyville at 5.5. 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.
- 1Oak Lawn 0%
- 2Lincolnwood 0%
- 3Franklin Park 0%
- 4Brookfield 0%
- 4Cary 0%
- 6Naperville 0%
- 7Chicago 0%
- 7Elgin 0%
- 9Decatur 0%
- 10Calumet City 0%
- 10Joliet 0%
- 12Des Plaines 0%
- 12Peoria 0%
- 14Moline 0%
- 15Granite City 0%
- 16Northbrook 0%
- 16Warrenville 0%
- 18Rockford 0%
- 19Upper Alton 0%
- 19Braidwood 0%
- 21Winthrop Harbor 0%
- 22Bloomington 0%
- 23East Saint Louis 0%
- 24Wood River 0%
- 24Champaign 0%
- 26Springfield 0%
- 27Savoy 0%
- 28Jerseyville 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, December 2024, smogrank.com/us/region/illinois/history/2024-12 (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.