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Primary air pollutant in the Alton area:
OZONE - 19 Good
Enjoy your outdoor activities.
Other Pollutants:
PM2.5 - 9 Good
Primary Pollutant: PM2.5 - 43 Good
Secondary Pollutant: OZONE - 22 Good
Primary Pollutant: OZONE - 25 Good
Secondary Pollutant: PM2.5 - 25 Good