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Primary air pollutant in the St. Charles area:
PM2.5 - 41 Good
Enjoy your outdoor activities.
Other Pollutants:
OZONE - 26 Good
Primary Pollutant: OZONE - 46 Good
Secondary Pollutant: PM2.5 - 40 Good
Primary Pollutant: PM2.5 - 50 Good
Secondary Pollutant: OZONE - 50 Good
Primary Pollutant: PM2.5 - 50 Good
Secondary Pollutant: OZONE - 50 Good