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Primary air pollutant in the San Marcos area:
PM2.5 - 57 Moderate
If you are unusually sensitive to particle pollution, consider reducing your activity level or shorten the amount of time you are active outdoors.
Other Pollutants:
PM10 - 22 Good
OZONE - 27 Good
Primary Pollutant: OZONE - 61 Moderate
Secondary Pollutant: PM2.5 - 58 Moderate
Primary Pollutant: PM2.5 - 55 Moderate
Secondary Pollutant: OZONE - 50 Good