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Primary air pollutant in the St. Charles area:
PM2.5 - 39 Good
Enjoy your outdoor activities.
Other Pollutants:
OZONE - 31 Good
Primary Pollutant: PM2.5 - 58 Moderate
Secondary Pollutant: OZONE - 44 Good
Primary Pollutant: PM2.5 - 50 Good
Secondary Pollutant: OZONE - 48 Good
Primary Pollutant: PM2.5 - 50 Good
Secondary Pollutant: OZONE - 50 Good