TABLE 3.

Relative Importance of Pollutants Based on Machine Learning Techniques

Decision Trees		Linear Regression		Random Forest
Pollutant	Importance	Pollutant	Importance	Pollutant	Importance
NO 2	100	NH 3	100	Ozone	100
Ozone	94.94	CO	37.07	NH 3	93.36
NH 3	81.9	Ozone	36.33	NO2	63.65
PM 10	68.97	PM 10	30.14	PM 10	48.94
PM2.5	52.53	NO2	27.99	SO2	40.63
SO2	26.63	PM2.5	22.12	AQI	32.58
CO	0	AQI	21.13	PM2.5	23.92
Toluene	0	SO2	12.3	CO	14.28
AQI	0	Toluene	11.41	Toluene	14.04
Benzene	0	Benzene	0	Benzene	0