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  4. San Mateo County

San Mateo County

California

2026-03-13 05:00
AQI (US)
Moderate
Pollutants|Pollens
PM2.5
μg/m³
10.5
NO2
μg/m³
49.1
O3
μg/m³
17.1
CO
μg/m³
625
Weather
  • ℃
  • ℉
11℃
80%
11 kph
0 of 11
Historical Data
  • Hourly
  • Daily
  • AQI (US)
  • Pollen
  • PM2.5
  • NO2
  • O3
  • CO
Places included
Atherton
AQI 50
Belmont
AQI 50
Brisbane
AQI 60
Broadmoor
AQI 60
Burlingame
AQI 50
Colma
AQI 60
Daly City
AQI 60
East Palo Alto
AQI 50
El Granada
AQI 50
Emerald Hills
AQI 50
Foster City
AQI 50
Half Moon Bay
AQI 50
Highlands-Baywood Park
AQI 50
Hillsborough
AQI 50
La Honda
AQI 50
Menlo Park
AQI 50
Millbrae
AQI 60
Montara
AQI 60
Moss Beach
AQI 50
North Fair Oaks
AQI 50
Pacifica
AQI 60
Pescadero
AQI 50
Portola Valley
AQI 50
Redwood City
AQI 50
San Bruno
AQI 60
San Carlos
AQI 50
San Mateo
AQI 50
South San Francisco
AQI 60
West Menlo Park
AQI 50
Woodside
AQI 50
Data Sources
http://www.airnow.gov/

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Cities Nearby

Half Moon Bay
AQI 50
El Granada
AQI 50
Highlands-Baywood Park
AQI 50
Emerald Hills
AQI 50
Woodside
AQI 50
Moss Beach
AQI 50
Belmont
AQI 50
San Carlos
AQI 50
Redwood City
AQI 50
Portola Valley
AQI 50
Hillsborough
AQI 50