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| Moderate 51 to 100 Unusually sensitive people should consider limiting prolonged outdoor exertion. |
| Unhealthy for Sensitive Groups 101 to 150 Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion. |
| Unhealthy 151 to 200 Active children and adults, and people with respiratory disease, such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged exertion. |
| Very Unhealthy 201 to 300 Active children and adults, and people with respiratory disease, such as asthma, should avoid all outdoor exertion; everyone else, especially children, should limit prolonged exertion. |
| Hazardous 301 to 500 Everyone should avoid all outdoor exertion. |
| Good 0 to 50 None |