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The area with the highest AQ Index (as of 23:00 PDT) in is in the Concord area. Particle Pollution (PM2.5) is measuring at 67 (Moderate). This means air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Over the next few days, the highest primary air pollutant will be Ozone (OZONE) in the Concord area. It is forecasted to be 101 (Unhealthy for Sensitive Groups), meaning members of sensitive groups may experience health effects. The general public is less likely to be affected.
Below is a clickable map of Contra Costa 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 21 minutes ago
Below is a list of cities in Contra Costa 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.