St. Louis (Metro-east)
 
Data courtesy of:
 

AQI Forecast - https://files.airnowtech.org/airnow/today/forecast_aqi_20160727_ia_il_mo.jpg Map Map Map Map Map Map Map Map Map Map Map Map Map Map Map
 
Legend: National Parks/Monuments National Parks/Monuments     Legend: Tribal Boundaries Tribal Boundaries
The tribal boundaries shown here are provided by the Bureau of Indian Affairs and are intended to be used as a general spatial reference only. They are not a formal determination of tribal boundaries by the EPA.
 - https://files.airnowtech.org/airnow/today/cur_aqi_ia_il_mo.jpg Map Map Map Map Map Map Map Map Map Map Map Map Map Map Map
 
Legend: National Parks/Monuments National Parks/Monuments     Legend: Tribal Boundaries Tribal Boundaries
The tribal boundaries shown here are provided by the Bureau of Indian Affairs and are intended to be used as a general spatial reference only. They are not a formal determination of tribal boundaries by the EPA.
AQI Animation - https://files.airnowtech.org/airnow/today/anim_aqi_ia_il_mo.gif Map Map Map Map Map Map Map Map Map Map Map Map Map Map Map
 
Legend: National Parks/Monuments National Parks/Monuments     Legend: Tribal Boundaries Tribal Boundaries
The tribal boundaries shown here are provided by the Bureau of Indian Affairs and are intended to be used as a general spatial reference only. They are not a formal determination of tribal boundaries by the EPA.
 
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 Day
 
Local Air Quality Resources
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
Air Quality Forecast
Today's High Tomorrow's High
Air Quality Index (AQI)
Unhealthy for Sensitive Groups Unhealthy for Sensitive Groups
Health Message: Active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy exertion outdoors.
Air Quality Index (AQI)
Moderate Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
AQI - Pollutant Details
Ozone
Unhealthy for Sensitive Groups
Unhealthy for Sensitive Groups
Particles (PM2.5)
Moderate
Moderate
Ozone
Moderate
Moderate
Particles (PM2.5)
Good
Good

Current Conditions
Air Quality Index (AQI)
observed at 21:00 CDT
38
Good
Health Message: None
Note: Values above 500 are considered Beyond the AQI. Follow recommendations for the Hazardous category. Additional information on reducing exposure to extremely high levels of particle pollution is available here.
AQI - Pollutant Details
Ozone 36 Good
Particles (PM2.5) 38 Good

Past Air Quality Maps and Data
Yesterday's Maps and Data
Air Quality Maps Archives (by region)