Hazardous is 301 to 500. The entire population is more likely to experience serious health effects and should avoid all outdoor physical activity, remain indoors and keep activity levels low.
Very Unhealthy is 201 to 300. People with heart and lung disease, older adults and children should avoid all outdoor physical activity. Everyone else should avoid prolonged or heavy outdoor exertion.
Unhealthy is 151 to 200. Everyone may begin to experience some adverse health effects and should limit prolonged or heavy outdoor exertion. Members of the sensitive groups should avoid prolonged outdoor exertion.
Unhealthy for Sensitive Groups is 101 to 150.People with heart and lung disease, older adults and children are at a greater risk and should limit prolonged or heavy outdoor exertion.
Moderate is 51 to 100. People who have a unique sensitivity to air pollution should consider limiting prolonged or heavy outdoor exertion.
Good is 0 to 50. No health impacts are expected when air quality is in this range.
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