| Air Quality Index (AQI) |
PM2.5 Health Effects Statement |
PM2.5 Cautionary Statement |
| Good (0-50) |
PM2.5 air pollution poses little or no risk. |
None |
| Moderate (51-100) |
Unusually sensitive individuals may experience respiratory symptoms. |
Unusually sensitive people should consider limiting prolonged outdoor exertion. |
| Unhealthy for Sensitive Groups (101-150) |
Increasing likelihood of respiratory symptoms in sensitive individuals, aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly. |
Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion. |
| Unhealthy (151-200) |
Increased aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly; increased respiratory effects in general population. |
Active children and adults, and people with respiratory disease, such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion. |
| Very Unhealthy (201-300) |
Significant aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly; significant increase in respiratory effects in general population. |
Active children and adults, and people with respiratory disease, such as asthma, should avoid all outdoor exertion; everyone else, especially children, should limit outdoor exertion. |
| Hazardous (301-500) |
Serious aggravation of heart or lung disease and premature mortality in persons with cardiopulmonary disease and the elderly; serious risk of respiratory effects in general population. |
Everyone should avoid all outdoor exertion. |
| Beyond Index (>500) |
Extremely High Levels of PM2.5 |
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