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Primary air pollutant in the Portola Valley area:
PM2.5 - 56 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:
OZONE - 18 Good
Primary Pollutant: OZONE - 41 Good
Primary Pollutant: OZONE - 39 Good
Primary Pollutant: OZONE - 39 Good
Primary Pollutant: OZONE - 0 Good
Primary Pollutant: OZONE - 0 Good
Primary Pollutant: OZONE - 0 Good
Primary Pollutant: OZONE - 0 Good