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  4. St. Louis County

St. Louis County

Missouri

2026-03-12 15:00
AQI (China)
Excellent
Pollutants|Pollens
O3
μg/m³
68.6
NO2
μg/m³
21.4
PM10
μg/m³
8.8
PM2.5
μg/m³
5.6
SO2
μg/m³
1.7
Weather
  • ℃
  • ℉
8℃
46%
12 kph
4 of 11
Historical Data
  • Hourly
  • Daily
  • AQI (China)
  • Pollen
  • O3
  • NO2
  • PM10
  • PM2.5
  • SO2
Places included
Airport Township
AQI 12
Bonhomme Township
AQI 9
Chesterfield Township
AQI 9
Clayton Township
AQI 11
Concord Township
AQI 6
Creve Coeur Township
AQI 12
Ferguson Township
AQI 12
Gravois Township
AQI 8
Hadley Township
AQI 12
Jefferson Township
AQI 11
Lemay Township
AQI 6
Lewis and Clark Township
AQI 12
Maryland Heights Township
AQI 21
Meramec Township
AQI 23
Midland Township
AQI 12
Missouri River Township
AQI 9
Normandy Township
AQI 12
Northwest Township
AQI 12
Norwood Township
AQI 11
Oakville Township
AQI 10
Queeny Township
AQI 9
Spanish Lake Township
AQI 9
St. Ferdinand Township
AQI 9
Tesson Ferry Township
AQI 10
University Township
AQI 12
Wildhorse Township
AQI 9
Data Sources
http://www.airnow.gov/

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Westwood
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