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The area with the highest AQ Index (as of 1:00 PST) in is in the Redwood City area. Ozone (OZONE) is measuring at 29 (Good). This means air quality is satisfactory, and air pollution poses little or no risk.
Over the next few days, the highest primary air pollutant will be Ozone (OZONE) in the Redwood City area. It is forecasted to be 32 (Good), meaning air quality is satisfactory, and air pollution poses little or no risk.
Below is a clickable map of San Mateo County, California. The markers on the map identify large, populated cities. If you hover over a marker, it will display the city name and the current AQ index. The color of the city markers also references the current AQ risk level.
| Range | 0 - 50 | 51 - 100 | 101 - 150 | 151 - 200 | 201 - 300 | 301 - 500 |
| Color | ||||||
| Category | Good | Moderate | Unhealthy for Sensitive Groups | Unhealthy | Very Unhealthy | Hazardous |
Last Updated 9 minutes ago
Below is a list of cities in San Mateo County where we track and forecast the AQ index. Click on a city name to get the current AQ index as well as any available forcasts.