Monitor the live Air Quality Index (AQI) in San Mateo County. See real-time pollution metrics including PM2.5, PM10, and health advisories for outdoor activities.
Air Quality Sensors Offline
We are currently unable to connect to the air quality monitoring stations for San Mateo County. Please check back later.
AQI Guidelines
- 0-50 (Good): Ideal air quality for outdoor activities.
- 51-100 (Moderate): Acceptable, but highly sensitive people should limit prolonged outdoor exertion.
- 101-150 (Unhealthy for Sensitive Groups): Children, older adults, and people with lung disease should reduce exposure.
- 151-200 (Unhealthy): Everyone may begin to experience health effects.
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Air Quality in San Mateo County - FAQ
Currently, the air quality sensors for San Mateo County are offline or undergoing maintenance.