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AQI Animation - http://www.epa.gov/airnow/2013/20130130/anim_aqi_chicago_il.gif
Peak AQI - http://www.epa.gov/airnow/2013/20130130/peak_aqi_chicago_il.jpg
Peak Ozone (8-hour) - http://www.epa.gov/airnow/2013/20130130/peak_o3_chicago_il.jpg
Peak Particles PM<sub>2.5</sub> (24-hour) - http://www.epa.gov/airnow/2013/20130130/peak_pm25_chicago_il.jpg
 
AQI: Good (0 - 50) AQI: Moderate (51 - 100) AQI: Unhealthy for Sensitive Groups (101 - 150) AQI: Unhealthy (151 - 200) AQI: Very Unhealthy (201 - 300) AQI: Hazardous(301 - 500) Action DayAction Day
 
Local Air Quality Resources
Action Day Programs | Forecast | Real-time Ozone Data Program | Today's AQI
 
State Air Quality Resources
Illinois EPA - Air Quality Index (AQI)
Illinois EPA - Air Quality Information
Illinois EPA - Bureau of Air
Illinois EPA - Contact Information
Illinois Environmental Protection Agency (EPA)
Partners for Clean Air
Respiratory Health Association of Metropolitan Chicago
Daily Peaks
Wednesday, January 30, 2013
Particles PM2.5
16 
 Good
Ozone
25 
 Good
select another date to see peak data and maps:
Note: peak data are available beginning August 1, 2010.

Other Information
Current Conditions and Forecasts
Air Quality Maps Archives (by region)