Table 2.

Spearman's correlation coefficients between air pollution and weather conditions in Guangzhou, 2012–2019.

	CO	PM2.5	NO2	PM10	SO2	O3_1h	Relative humidity	Mean temperature
CO	1.000
PM2.5	0.680*	1.000
NO2	0.646*	0.753*	1.000
PM10	0.616*	0.974*	0.755*	1.000
SO2	0.422*	0.653*	0.490*	0.673*	1.000
O3_1h	−0.197*	0.286*	−0.001	0.314*	0.299*	1.000
Relative humidity	−0.034*	−0.436*	−0.175*	−0.450*	−0.395*	−0.551*	1.000
Mean temperature	−0.563*	−0.398*	−0.468*	−0.325*	−0.084*	0.383*	0.148*	1.000

Note: *p < 0.001.