Table 1.

Summary statistics of key model variables.

Variables	Unit	Obs.	Mean	Std. Dev.	Min	Max
AQI	N/A	5507	86.223	52.148	14.750	430.083
PM2.5	μg/m3	5507	53.787	46.000	3.667	400.250
PM10	μg/m3	5507	93.230	62.205	7.957	508.250
SO2	μg/m3	5507	14.302	9.666	1.458	78.292
NO2	μg/m3	5507	38.106	19.157	3.250	117.875
CO	mg/m3	5507	1.006	0.635	0.144	7.417
Temperature	℃	5507	11.217	11.721	−14.233	33.6
Humidity	%	5507	56.625	19.185	11.000	100
Wind speed	m/s	5507	2.158	1.033	0.300	7.500
Precipitation	mm	5507	1.040	4.586	0	84.333