Primary air pollutant in the O Fallon area:

PM2.5 - 52 Moderate

If you are unusually sensitive to particle pollution, consider reducing your activity level or shorten the amount of time you are active outdoors.

Primary air pollutant in the O Fallon area:

OZONE - 13 Good

Enjoy your outdoor activities.

Other Pollutants:

PM10 - 19 Good