SmogRank / World / United States / Illinois / May 2024
Most polluted cities in Illinois, United States, May 2024
24 cities in Illinois, United States ranked by their average PM2.5 over the 31 days. Worst: Granite City at 7.8 µg/m³, #1,370 of 2,641 cities in the world. Cleanest: Winthrop Harbor at 4.6. 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.
- 1Granite City 0%
- 2East Saint Louis 0%
- 2Calumet City 0%
- 2Naperville 0%
- 5Brookfield 0%
- 5Chicago 0%
- 7Cary 0%
- 8Franklin Park 0%
- 9Joliet 0%
- 10Des Plaines 0%
- 11Decatur 0%
- 11Champaign 0%
- 13Northbrook 0%
- 13Rockford 0%
- 15Peoria 0%
- 16Springfield 0%
- 16Oak Lawn 0%
- 18Bloomington 0%
- 19Jerseyville 0%
- 19Braidwood 0%
- 21Wood River 0%
- 22Savoy 0%
- 23Moline 0%
- 24Winthrop Harbor 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, May 2024, smogrank.com/us/region/illinois/history/2024-05 (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.