Table 3.

Spearman correlation coefficients of temperature, relative humidity, and air pollutants

	PM2.5	PM10	CO	NO	NO2	NOx	O3	O3a	SO2	RH	TEMP
PM2.5	1	0.95	0.66	0.07	0.61	0.52	0.47	0.62	0.63	−0.33	−0.31
PM10		1	0.61	0.07	0.59	0.50	0.47	0.61	0.64	−0.38	−0.32
CO			1	0.47	0.82	0.84	0.16	0.28	0.47	−0.07	− 0.60
NO				1	0.52	0.70	− 0.52	− 0.27	0.28	0.08	−0.24
NO2					1	0.95	0.06	0.23	0.54	−0.12	−0.56
NOx						1	−0.06	0.13	0.51	−0.08	−0.56
O3							1	0.88	0.23	−0.32	−0.04
O3, max 8 h								1	0.41	−0.39	0.05
SO2									1	−0.33	−0.04
RH										1	−0.03
TEMP											1

^a8 h maximum

RH Relative humidity, TEMP Ambient temperature