Table 2. Spearman correlation between air pollutants and weather conditions.

Index	PM2.5	PM10	SO2	NO2	O3	CO
PM2.5	-	-	-	-	-	-
PM10	0.83**	-	-	-	-	-
SO2	0.52**	0.37**	-	-	-	-
NO2	0.72**	0.57**	0.49**	-	-	-
O3	-0.17**	-0.03*	-0.50**	-0.11**	-	-
Mean temperature	-0.34**	-0.21**	-0.81**	-0.25**	0.70**	-
Average relative humidity	-0.02**	-0.22**	-0.05**	-0.09**	-0.23**	0.09*

*P<0.05

**P<0.01.