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Primary air pollutant in the San Mateo area:
OZONE - 29 Good
Enjoy your outdoor activities.
Other Pollutants:
PM2.5 - 4 Good
Primary Pollutant: OZONE - 37 Good
Primary Pollutant: OZONE - 36 Good
Primary Pollutant: OZONE - 0 Good
Primary Pollutant: OZONE - 0 Good