Table 2.

Spearman correlation coefficients between human mobility index, air quality index, air pollutants, and meteorological variables across all cities and days.

	Human mobility index	Air quality index	PM2.5	PM10	NO2	O3	SO2	CO	Mean temperature	Relative humidity	Atmospheric pressure	Wind speed
Human mobility index	1.00
Air quality index	0.05*	1.00
PM2.5	0.06*	0.92*	1.00
PM10	0.08*	0.93*	0.91*	1.00
NO2	0.05*	0.60*	0.64*	0.65*	1.00
O3	−0.04*	0.29*	0.13*	0.19*	0.08*	1.00
SO2	−0.03	0.37*	0.37*	0.45*	0.52*	0.11*	1.00
CO	0.04*	0.60*	0.69*	0.62*	0.63*	−0.04*	0.39*	1.00
Mean temperature	0.18*	−0.11*	−0.13*	−0.17*	−0.18*	0.08*	−0.52*	−0.09*	1.00
Relative humidity	0.07*	−0.06*	0.08*	−0.08*	−0.07*	−0.40*	−0.41*	0.12*	0.34*	1.00
Atmospheric pressure	−0.10*	0.03	0.07*	0.02	0.04*	−0.04*	−0.21*	−0.04*	0.15*	0.27*	1.00
Wind speed	−0.05*	−0.15*	−0.21*	−0.13*	−0.22*	0.04*	−0.03	−0.22*	−0.07*	−0.13*	0.12*	1.00

*p < 0.05.