Chicago Air Quality Index
Chicago, Usa · Real-time AQI data
Air quality is satisfactory, and air pollution poses little or no risk.
Pollutant Breakdown
PM2.5
16µg/m³
Station: Chi_sp, Illinois, USA · Mar 17, 04:00 PM · Updates every 30 min
Health Recommendations
Air quality is satisfactory, and air pollution poses little or no risk.
How does Chicago compare to other cities?
Compare →AQI Scale Reference
Other Cities in Usa
About Air Quality in Chicago
The Air Quality Index (AQI) in Chicago is measured using monitoring stations that track six key pollutants: PM2.5, PM10, ground-level ozone, nitrogen dioxide, sulfur dioxide, and carbon monoxide. The AQI is calculated using US EPA standards and ranges from 0 (excellent) to 500 (hazardous).
PM2.5 is typically the dominant pollutant in Chicago during high-pollution periods. Fine particulate matter from traffic, industry, and seasonal factors can push AQI above 150, which is considered unhealthy for all groups.
Check the health effects guide to understand what today's AQI means for your activity level, or see the global AQI rankings to compare Chicago with other cities worldwide.