SmogRank / World / United States / Illinois / June 2026
Most polluted cities in Illinois, United States, June 2026
31 cities in Illinois, United States ranked by their average PM2.5 over the 30 days. Worst: Dolton at 9.3 µg/m³, #740 of 2,466 cities in the world. Cleanest: Braidwood 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.
- 1Dolton 0%
- 1Elmwood Parklow-cost sensors 0%
- 3Granite City 0%
- 4Upper Alton 0%
- 5Wood River 0%
- 6Oak Lawn 0%
- 7Bridgeview 0%
- 7Peoria 0%
- 9Decatur 0%
- 9East Saint Louis 0%
- 11Franklin Park 0%
- 12Elgin 0%
- 13Brookfield 0%
- 14Springfield 0%
- 14Lincolnwood 0%
- 16Calumet City 0%
- 17Northbrook 0%
- 18Champaign 0%
- 18Chicago 0%
- 18Savoy 0%
- 21Jerseyville 0%
- 22Naperville 0%
- 23Rockford 0%
- 24Cary 0%
- 24Joliet 0%
- 24Warrenville 0%
- 27Des Plaines 0%
- 27Winthrop Harbor 0%
- 29Bloomington 0%
- 30Moline 0%
- 31Braidwood 0%
Low-cost sensors: consumer units, counted only in cities with no government-grade monitor; they read close to reference monitors on the whole, but 15 to 25% high in humid air. How we use them.
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, June 2026 · All cities in United States, June 2026 · Illinois now
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SmogRank, most polluted cities in Illinois, United States, PM2.5, June 2026, smogrank.com/us/region/illinois/history/2026-06 (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.