Table 3.

Spearman’s rank coefficients between daily mean air pollutants and meteorological variables

Variables	PM2.5	NO2	O3	Temperature	Relative humidity	Air pressure
PM2.5	1.00
NO2	0.55*	1.00
O3	0.56*	0.02	1.00
Temperature	−0.43*	−0.27*	−0.09*	1.00
Relative humidity	−0.53*	−0.1*	−0.51*	0.27*	1.00
Air pressure	0.50*	0.26*	0.21*	−0.85*	−0.45*	1.00

*P<0.05.

NO₂, nitrogen dioxide; O₃, ozone; PM_2.5, fine particulate matter.