Table 1.

Comprehensive Air-quality Index (CAI)

Category	Description	Values	Health effects
A	Good	0–50	A level that will not impact patients suffering from diseases related to air pollution
B	Moderate	51–100	A level that may have minimal impact on patients in cases of chronic exposure
C	Unhealthy	101–250	A level that may have harmful impacts on patients and members of sensitive groups, and that may also cause the general public unpleasant side effects
D	Very unhealthy	251–500	A level that may require emergency measures for patients and members of sensitive groups, and that may have harmful impacts on the general public