Air Quality Index (AQI): Ozone
Index
Values
Levels
of Health
Concern
Cautionary Statements
0-50 Good
None
51-100* Moderate
Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
101-150 Unhealthy for Sensitive Groups
Active children and adults, and people with lung disease, such as asthma, should reduce prolonged or heavy exertion outdoors.
151-200 Unhealthy
Active children and adults, and people with lung disease, such as asthma, should avoid prolonged or heavy exertion outdoors. Everyone else, especially children, should reduce prolonged or heavy exertion outdoors.
201-300 Very Unhealthy
Active children and adults, and people with lung disease, such as asthma, should avoid all outdoor exertion. Everyone else, especially children, should avoid prolonged or heavy exertion outdoors.
301-500 Hazardous
Everyone should avoid all physical activity outdoors.
* Generally, an AQI of 100 for ozone corresponds to an ozone level of 0.076 parts per million (averaged over 8 hours).

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