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20
Air Quality Index (AQI) icons*
Good
0 - 50
Little to no health risk
Moderate
51 - 100
Sensitive individuals may
experience irritations
Unhealthy for
Sensitive Groups**
101 - 150
Sensitive groups should limit
outdoor exertion
Unhealthy
151 - 200
Harmful for sensitive groups,
reduced outdoor activity
Very Unhealthy
201 - 300
Everyone can be affected.
Avoid heavy outdoor activity
Hazardous
301 +
Serious risk of respiratory
effects. Everyone should avoid
outdoor activities
* Following US EPA Standards for Particle Pollution to calculate AQI
**Sensitive groups include people with respiratory or heart disease, children and the elderly
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