| Health Advisory Categories | ||||
| Categories | Particulate
levels PM2.5
( 24 hr average in micrograms/cubic meter) |
Air Quality
Index
(AQI) |
Visibility
(miles) |
Actions to take |
| Good | 0 to 15.4 | 0 to 40 | 10 or more | - No health impacts are expected. |
| Moderate | 15.5 to 40.4 | 41 to 80 | 6 to 9 | -Unusually sensitive people such as those with asthma should limit outdoor activity. |
| Unhealthy for sensitive groups | 40.5 to 65.4 | 81 to 175 | 3 to 5 | - Active children and adults with respiratory disease such as asthma should limit outdoor activity. |
| Unhealthy | 65.5 to 150.4 | 176 to 300 | 1.5 to 2.5 | -
Everyone, especially children, should limit outdoor activity.
- People with respiratory disease such as asthma should avoid the outdoors. |
| Very unhealthy | 150.5 to 250.4 | 301 to 500 | 0.9 to 1.4 | -
Everyone especially children should limit outdoor activities.
- People with respiratory disease, such as asthma , should avoid all outdoor activities. |
| Hazardous | Over 250.5 | Over 500 | 0.8 or less | - Everyone should avoid any outdoor activities. |