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Primary air pollutant in the Calhan area:
PM2.5 - 36 Good
Enjoy your outdoor activities.
Other Pollutants:
OZONE - 32 Good
Primary Pollutant: PM2.5 - 0 Good
Secondary Pollutant: OZONE - 0 Good
Primary Pollutant: PM2.5 - 0 Good
Secondary Pollutant: OZONE - 0 Good