The AQI is an index for reporting daily air quality. It tells you how clean or unhealthy your air is, and what associated health effects might be a concern. The AQI focuses on health effects you may experience within a few hours or days after breathing unhealthy air. The following chart provides information regarding the AQI determinations:
Category |
AQI Value |
What This Means |
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 for 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 |
Health alert: everyone may experience more serious health effects. |