Home > USA > California > San Mateo County > Portola Valley
Primary air pollutant in the Portola Valley area:
PM2.5 - 31 Good
Enjoy your outdoor activities.
Other Pollutants:
OZONE - 4 Good
PM10 - 19 Good
Primary Pollutant: OZONE - 40 Good
Primary Pollutant: OZONE - 39 Good
Primary Pollutant: PM2.5 - 0 Good
Primary Pollutant: PM2.5 - 0 Good