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  4. San Mateo County

San Mateo County

California

2026-01-22 18:00
AQI (US)
Moderate
Pollutants|Pollens
PM2.5
μg/m³
23.3
NO2
μg/m³
24
CO
μg/m³
750
O3
μg/m³
10.7
Weather
  • ℃
  • ℉
14℃
74%
7 kph
2 of 11
Historical Data
  • Hourly
  • Daily
  • AQI (US)
  • Pollen
  • PM2.5
  • NO2
  • CO
  • O3
Places included
Atherton
AQI 83
Belmont
AQI 83
Brisbane
AQI 66
Broadmoor
AQI 66
Burlingame
AQI 83
Colma
AQI 66
Daly City
AQI 66
East Palo Alto
AQI 83
El Granada
AQI 83
Emerald Hills
AQI 83
Foster City
AQI 83
Half Moon Bay
AQI 83
Highlands-Baywood Park
AQI 83
Hillsborough
AQI 83
La Honda
AQI 83
Menlo Park
AQI 83
Millbrae
AQI 66
Montara
AQI 66
Moss Beach
AQI 83
North Fair Oaks
AQI 83
Pacifica
AQI 66
Pescadero
AQI 83
Portola Valley
AQI 83
Redwood City
AQI 83
San Bruno
AQI 66
San Carlos
AQI 83
San Mateo
AQI 83
South San Francisco
AQI 66
West Menlo Park
AQI 83
Woodside
AQI 83
Data Sources
http://www.airnow.gov/

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Cities Nearby

Half Moon Bay
AQI 83
El Granada
AQI 83
Highlands-Baywood Park
AQI 83
Emerald Hills
AQI 83
Woodside
AQI 83
Moss Beach
AQI 83
Belmont
AQI 83
San Carlos
AQI 83
Redwood City
AQI 83
Portola Valley
AQI 83
Hillsborough
AQI 83