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Primary air pollutant in the San Mateo area:
PM2.5 - 21 Good
Enjoy your outdoor activities.
Primary Pollutant: OZONE - 42 Good
Primary Pollutant: OZONE - 38 Good
Primary Pollutant: OZONE - 37 Good
Primary Pollutant: OZONE - 0 Good
Primary Pollutant: OZONE - 0 Good