O'Fallon air quality index

Good

Primary Pollutant：
O3

PM2.5 (Particulate matter less than 2.5 microns)
Good
1.67 µg/m3

CO (Carbon Monoxide)
Good
1 µg/m3

NO2 (Nitrogen Dioxide)
Good
2 µg/m3

O3 (Ozone)
Good
17 µg/m3

PM10 (Particulate matter less than 10 microns)
Good
1 µg/m3

SO2 (Sulphur Dioxide)
Good
1 µg/m3