Table 3.

Descriptive statistics of continuous variables.

	Minimum	Maximum	Mean ± SD.
New confirmed	−1	14,106	338.34 ± 1165.36
Meteorological factors
Temp (°F)	32.94	80.42	62.43 ± 14.49
Wdsp(knots)	3.42	6.53	4.79 ± 0.62
Prcp(inches)	0.005	0.43	0.14 ± 0.09
Gust (knots)	4.25	22.63	9.89 ± 3.68
The concentration of air pollutants
AQI	29.21	104.69	52.04 ± 16.36
PM2.5(μg/m3)	12.50	77.64	29.32 ± 13.36
PM10(μg/m3)	25.84	98.52	53.95 ± 17.60
NO2(μg/m3)	10.21	37.00	21.02 ± 4.75
SO2(μg/m3)	7.02	17.26	9.43 ± 1.71
CO(mg/m3)	0.54	1.21	0.68 ± 0.13
O3 (μg/m3)	38.51	102.03	69.22 ± 11.34
migration index
Im	0.24	2.29	0.83 ± 0.43
Em	0.24	2.20	0.83 ± 0.41
Inner	2.09	5.41	3.99 ± 1.02