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Primary air pollutant in the San Mateo area:
PM2.5 - 41 Good
Enjoy your outdoor activities.
Other Pollutants:
OZONE - 7 Good
Primary Pollutant: PM2.5 - 50 Good
Primary Pollutant: PM2.5 - 53 Moderate
Primary Pollutant: PM2.5 - 0 Good
Primary Pollutant: PM2.5 - 0 Good
Primary Pollutant: PM2.5 - 0 Good
Primary Pollutant: PM2.5 - 0 Good