Table 1.

Air Quality Index (AQI) of particulate matter emissions and their health concerns.^33–35

S.No	Air quality index numbers	Level of health concern (Descriptor)	Health message	Air quality index color
1	0-50	Good	None	Green
2	51-100	Moderate	Unusually sensitive people should reduce prolonged or heavy exertion	Yellow
3	101-150	Unhealthy for sensitive groups	Sensitive groups should reduce prolonged or heavy exertion	Orange
4	151-200	Unhealthy	Sensitive groups should avoid prolonged or heavy exertion; general public should reduce prolonged or heavy exertion	Red
5	201-300	Very Unhealthy	Sensitive groups should avoid all physical activity outdoors; general public should avoid prolonged or heavy exertion	Purple
6	301-500	Hazardous	Everyone should avoid all physical activity outdoors	Maroon