Table 2.

The correlation between COVID-19 incidence and three ambient air pollutants along with five meteorological parameters, Jan 26th to Feb 29th in 2020 in Wuhan and XiaoGan, China. The data marked with *, ** and *** indicated statistical significance, where p < 0.05, 0.01 and 0.001, respectively.

	Wuhan		XiaoGan
	Slope	R2	Slope	R2
Air quality index (AQI)	0.015 ± 0.007*	0.127	0.133 ± 0.046**	0.222
Ambient air pollutants
PM2.5	0.015 ± 0.006*	0.174	0.117 ± 0.046**	0.23
PM10	0.117 ± 0.006	0.105	0.105 ± 0.044*	0.158
NO2	0.007 ± 0.002***	0.329	0.015 ± 0.007*	0.158
CO	0.000 ± 0.000**	0.203	−0.000 + 0.000	0.022
Meteorological data
Temperature	−0.002 ± 0.001*	0.126	−0.014 ± 0.007*	0.13
Daily highest temp	−0.002 ± 0.001	0.114	−0.014 ± 0.009	0.076
Daily lowest temp	−0.003 ± 0.001*	0.143	−0.013 ± 0.007	0.109
Daily temp diff	0.000 ± 0.001	0.003	−0.001 ± 0.007	0.001
Sunshine duration	−0.000 ± 0.000	0.000	−0.002 ± 0.000***	0.407