IL · 14 reporting areas
Illinois air quality today
AirNow lists 14 reporting areas in Illinois; 14 have a current hourly AQI. The highest current reading is AQI 88 (Moderate, PM2.5). Preliminary EPA AirNow data; latest reading Oct 28, 2026, 3:00 AM EDT.
All Illinois areas
| Area | AQI now | Main pollutant | As of (local) | Today's forecast |
|---|---|---|---|---|
| Aurora and Elgin | 88Moderate | PM2.5 | 2:00 AM CDT | Moderate |
| Lake County | 85Moderate | PM2.5 | 2:00 AM CDT | Moderate |
| North and West Suburbs (Chicago) | 85Moderate | PM2.5 | 2:00 AM CDT | Moderate |
| Chicago | 77Moderate | PM2.5 | 2:00 AM CDT | Moderate |
| South and West Suburbs (Chicago) | 77Moderate | PM2.5 | 2:00 AM CDT | Moderate |
| Rockford | 69Moderate | PM2.5 | 2:00 AM CDT | Moderate |
| Champaign | 65Moderate | PM2.5 | 2:00 AM CDT | Moderate |
| Joliet and Will County | 63Moderate | PM2.5 | 2:00 AM CDT | Moderate |
| St. Louis (Metro-east) | 63Moderate | PM2.5 | 2:00 AM CDT | Moderate |
| Peoria | 53Moderate | PM2.5 | 2:00 AM CDT | Moderate |
| Rock Island-Moline | 53Moderate | PM2.5 | 2:00 AM CDT | Moderate |
| Bloomington and Normal | 52Moderate | PM2.5 | 2:00 AM CDT | Moderate |
| Decatur | 51Moderate | PM2.5 | 2:00 AM CDT | Moderate |
| Springfield | 47Good | PM2.5 | 2:00 AM CDT | Moderate |
Source: U.S. EPA AirNow reporting area file, published Oct 28, 2026, 3:15 AM EDT. Areas without a number report a category only or have no current reading.
Reading this table
Each area's AQI is the highest of the pollutants its agency reports, usually ozone or fine particles (PM2.5). A reading of 101 or more is Unhealthy for Sensitive Groups. Open an area to see its forecast, nearby monitor readings and health guidance, or see the AQI scale.
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Preliminary data. AirNow readings and forecasts come from federal, state, local and tribal air quality agencies. They are not fully verified, may change, and must not be used for regulatory or official decisions; official data are in EPA's Air Quality System. For the latest official readings and advisories, check AirNow.gov and your state or local air agency.
This page is general information, not medical advice. If you have symptoms or a health condition, follow your doctor's guidance.