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  4. San Mateo County

San Mateo County

California

2025-12-11 21:00
CAQI (Europe)
Very Low
Pollutants|Pollens
PM2.5
μg/m³
8.7
O3
μg/m³
25.7
NO2
μg/m³
16
CO
μg/m³
375
Weather
  • ℃
  • ℉
14℃
67%
8 kph
2 of 11
Historical Data
  • Hourly
  • Daily
  • CAQI (Europe)
  • Pollen
  • PM2.5
  • O3
  • NO2
  • CO
Places included
Atherton
AQI 10
Belmont
AQI 10
Brisbane
AQI 25
Broadmoor
AQI 25
Burlingame
AQI 10
Colma
AQI 25
Daly City
AQI 25
East Palo Alto
AQI 10
El Granada
AQI 10
Emerald Hills
AQI 10
Foster City
AQI 10
Half Moon Bay
AQI 10
Highlands-Baywood Park
AQI 10
Hillsborough
AQI 10
La Honda
AQI 10
Menlo Park
AQI 10
Millbrae
AQI 25
Montara
AQI 25
Moss Beach
AQI 10
North Fair Oaks
AQI 10
Pacifica
AQI 25
Pescadero
AQI 10
Portola Valley
AQI 10
Redwood City
AQI 11
San Bruno
AQI 25
San Carlos
AQI 10
San Mateo
AQI 10
South San Francisco
AQI 25
West Menlo Park
AQI 10
Woodside
AQI 10
Data Sources
http://www.airnow.gov/

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Cities Nearby

Half Moon Bay
AQI 10
El Granada
AQI 10
Highlands-Baywood Park
AQI 10
Emerald Hills
AQI 10
Woodside
AQI 10
Moss Beach
AQI 10
Belmont
AQI 10
San Carlos
AQI 10
Redwood City
AQI 11
Portola Valley
AQI 10
Hillsborough
AQI 10