| Good Air Quality |
0-50 |
< 54 μg/m3 |
< 12 μg/m3 |
Air quality is considered satisfactory, and air pollution poses little or no risk |
| Moderate Air Quality |
50-100 |
< 154 μg/m3 |
< 35.4 μg/m3 |
Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution. |
| Unhealthy for some |
100-150 |
< 254 μg/m3 |
< 55.4 μg/m3 |
Members of sensitive groups may experience health effects. The general public is not likely to be affected. |
| Unhealthy Air Quality |
150-200 |
< 354 μg/m3 |
< 150.4 μg/m3 |
Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects. |
| Very Unhealthy |
200-300 |
< 424 μg/m3 |
< 250.4 μg/m3 |
Health alert: everyone may experience more serious health effects |
| Hazardous Air Quality |
> 300 |
> 424 μg/m3 |
> 250.4 μg/m3 |
Health warnings of emergency conditions. The entire population is more likely to be affected |
| More information: EPA Air Quality Index Davis sensor Sensor data captured at: 12-09-2025 10:22 Temperature: 56.2°F Humidity: 91.1% Dewpoint: 53.6°F |