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Primary air pollutant in the St. Charles area:
PM2.5 - 60 Moderate
If you are unusually sensitive to particle pollution, consider reducing your activity level or shorten the amount of time you are active outdoors.
Other Pollutants:
OZONE - 31 Good
Primary Pollutant: PM2.5 - 51 Moderate
Secondary Pollutant: OZONE - 37 Good
Primary Pollutant: PM2.5 - 57 Moderate
Secondary Pollutant: OZONE - 44 Good
Primary Pollutant: PM2.5 - 52 Moderate
Secondary Pollutant: OZONE - 46 Good