What is AQHI?

Air Quality Health Index (AQHI) help understand the impact of air quality on health. It is a health protection tool used to make decisions to reduce short-term exposure to air pollution by adjusting activity levels during increased levels of air pollution.


level of health risk :
12345678910+
Risk:Low (1-3)Moderate (4-6)High (7-10)Very high (above 10)

For your reference:

Hong Kong
http://www.gov.hk/en/residents/environment/air/aqhi.htm

Canada
http://www.ec.gc.ca/cas-aqhi/