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Primary air pollutant in the San Marcos area:
PM2.5 - 23 Good
Enjoy your outdoor activities.
Other Pollutants:
PM10 - 8 Good
Primary Pollutant: OZONE - 32 Good
Secondary Pollutant: PM2.5 - 22 Good
Primary Pollutant: OZONE - 39 Good
Secondary Pollutant: PM2.5 - 28 Good