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Air Quality Index (AQI)
AQI, or Air Quality Index, is a system for
reporting the severity of air quality levels
in a way that is easy to understand.
The index ranges from 0 to 500, where
h i g h e r i n d e x v a l u e s i n d i c a t e h i g h e r
levels of air pollution.
AQI is computed in different ways
around the world. The United States and
China, however, represent the two most
widely used AQI systems. Your AirVisual
Pro supports both systems.
Chinese and USA AQI scales are comparable
for values above 200. For lower values,
the US AQI is more stringent.*
* AirVisual recommends following the US AQI.
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
for
everyone
Very Unhealthy
201 - 300
Everyone can be affected.
Avoid heavy outdoor activity
Hazardous
301 +
Serious risks of respiratory
effects. Everyone should
avoid outdoor activities
* Following the US EPA Standards for Particle Pollution to calculate AQI
**Sensitive groups include people with respiratory or heart disease, children and the elderly
AQI
Air Quality Index
4


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