AQI Levels of Health Concern | Numerical Value | Meaning |
Good | 0 - 50 | Air quality is considered satisfactory, and air pollution poses little or no risk. |
Moderate | 51 - 100 | 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, sensitive groups | 101 - 150 | Members of sensitive groups may experience health effects. The general public is not likely to be affected. |
Unhealthy | 151 - 200 | Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects. |
Very Unhealthy | 201 - 300 | Health warnings of emergency conditions. The entire population is more likely to be affected. |
Hazardous | 301 - 500 | Everyone may experience more serious health effects. |