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  3. California
  4. San Mateo County

San Mateo County

California

2026-01-19 22:00
AQI (US)
Moderate
Pollutants|Pollens
PM2.5
μg/m³
11
NO2
μg/m³
32
O3
μg/m³
23.6
CO
μg/m³
625
Weather
  • ℃
  • ℉
18℃
50%
3 kph
2 of 11
Historical Data
  • Hourly
  • Daily
  • AQI (US)
  • Pollen
  • PM2.5
  • NO2
  • O3
  • CO
Places included
Atherton
AQI 54
Belmont
AQI 54
Brisbane
AQI 54
Broadmoor
AQI 54
Burlingame
AQI 54
Colma
AQI 54
Daly City
AQI 54
East Palo Alto
AQI 54
El Granada
AQI 54
Emerald Hills
AQI 54
Foster City
AQI 54
Half Moon Bay
AQI 54
Highlands-Baywood Park
AQI 54
Hillsborough
AQI 54
La Honda
AQI 54
Menlo Park
AQI 54
Millbrae
AQI 54
Montara
AQI 54
Moss Beach
AQI 54
North Fair Oaks
AQI 54
Pacifica
AQI 54
Pescadero
AQI 54
Portola Valley
AQI 54
Redwood City
AQI 54
San Bruno
AQI 54
San Carlos
AQI 54
San Mateo
AQI 54
South San Francisco
AQI 54
West Menlo Park
AQI 54
Woodside
AQI 54
Data Sources
http://www.airnow.gov/

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Cities Nearby

Half Moon Bay
AQI 54
El Granada
AQI 54
Highlands-Baywood Park
AQI 54
Emerald Hills
AQI 54
Woodside
AQI 54
Moss Beach
AQI 54
Belmont
AQI 54
San Carlos
AQI 54
Redwood City
AQI 54
Portola Valley
AQI 54
Hillsborough
AQI 54