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  4. San Mateo County

San Mateo County

California

2026-01-21 01:00
AQI (US)
Moderate
Pollutants|Pollens
PM2.5
μg/m³
14.2
NO2
μg/m³
38.8
CO
μg/m³
875
O3
μg/m³
8.6
Weather
  • ℃
  • ℉
11℃
77%
0 kph
0 of 11
Historical Data
  • Hourly
  • Daily
  • AQI (US)
  • Pollen
  • PM2.5
  • NO2
  • CO
  • O3
Places included
Atherton
AQI 58
Belmont
AQI 58
Brisbane
AQI 66
Broadmoor
AQI 66
Burlingame
AQI 58
Colma
AQI 66
Daly City
AQI 66
East Palo Alto
AQI 58
El Granada
AQI 58
Emerald Hills
AQI 58
Foster City
AQI 58
Half Moon Bay
AQI 58
Highlands-Baywood Park
AQI 58
Hillsborough
AQI 58
La Honda
AQI 58
Menlo Park
AQI 58
Millbrae
AQI 66
Montara
AQI 66
Moss Beach
AQI 58
North Fair Oaks
AQI 58
Pacifica
AQI 66
Pescadero
AQI 58
Portola Valley
AQI 58
Redwood City
AQI 58
San Bruno
AQI 66
San Carlos
AQI 58
San Mateo
AQI 58
South San Francisco
AQI 66
West Menlo Park
AQI 58
Woodside
AQI 58
Data Sources
http://www.airnow.gov/

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Cities Nearby

Half Moon Bay
AQI 58
El Granada
AQI 58
Highlands-Baywood Park
AQI 58
Emerald Hills
AQI 58
Woodside
AQI 58
Moss Beach
AQI 58
Belmont
AQI 58
San Carlos
AQI 58
Redwood City
AQI 58
Portola Valley
AQI 58
Hillsborough
AQI 58