| Visibility |
AQI |
Health Category |
Cautionary statements |
| 15+ miles |
0-50 |
Good |
None |
| 8-14 miles |
51-100 |
Moderate |
None |
| 3-7 miles |
101-150 |
Unhealthy for sensitive groups |
People with respiratory or heart disease, the elderly and children should limit prolonged exertion. |
| 1½ - 2½ miles |
151-200 |
Unhealthy |
People with respiratory or heart disease, the elderly and children should avoid prolonged exertion; everyone else should limit prolonged exertion. |
| 1 mile |
201-300 |
Very unhealthy |
People with respiratory or heart disease, the elderly and children should avoid any outdoor activity; everyone else should avoid prolonged exertion. |
| <½ mile |
>300 |
Hazardous |
Everyone should avoid any outdoor exertion; people with respiratory or heart disease, the elderly and children should remain indoors. |
