Illinois, Missouri Unknown Air Quality Alert | Effective 09/17/2026 13:27

Headline: 
Air Quality Alert issued September 17 at 3:27PM CDT by NWS St Louis MO
Event: 
Air Quality Alert
Urgency: 
Unknown
Effective: 
September 17, 2026 - 1:27pm
Expires: 
September 18, 2026 - 6:00pm
Description: 
The St. Louis Clean Air Partnership has issued an air quality alert for the St. Louis metropolitan area from 10 AM to 8 PM CDT Friday. An Orange air quality forecast means that maximum ozone concentrations are expected to reach levels that pose a health risk. Adverse health effects increase as air quality deteriorates. Ground- level ozone is an air contaminant which can cause breathing difficulties for children, older adults, as well as persons with respiratory problems. Reducing outdoor physical activity is recommended. If it is a regularly scheduled work day you are urged to consider telecommuting, carpooling, or utilizing public transit. Avoid excessive idling and do not top off when refueling motor vehicles. The use of gasoline-powered lawn equipment should be reduced or postponed until late in the day. For more information visit the St. Louis Clean Air Partnership at http://cleanair-stlouis.com/ For current Air Quality Index (AQI) values visit https://www.airnow.gov/
Area Description: 
Madison; St. Clair; Monroe; St. Charles; Franklin; St. Louis; St. Louis City; Jefferson
Forcast Office: 
NWS St Louis MO
Sender: 
w-nws.webmaster@noaa.gov