Table 1.

Chemical composition analysis of the PM_2.5 samples.

	Component	Concentration (μg/mg)
Metal elements	Ca	13.76 ± 0.30
	K	10.33 ± 0.03
	Na	7.96 ± 0.08
	Fe	7.06 ± 0.13
	Al	6.24 ± 0.06
	Mg	3.98 ± 0.09
	Ti	1.66 ± 0.02
	Zn	1.62 ± 0.01
	Pb	0.54 ± 0.002
	Mn	0.35 ± 0.004
	Cu	0.20 ± 0.003
	V	0.13 ± 0.002
	Ba	0.13 ± 0.001
	Cr	0.081 ± 0.001
	As	0.064 ± 0.001
	Ni	0.045 ± 0.001
	Sr	0.045 ± 0.003
	Cd	0.014 ± 0.001
	Mo	0.11 ± 0.001
	Cs	0.006 ± 0.0003
	Co	0.004 ± 0.0008
Inorganic ions	SO42−	212.71 ± 3.67
	NO3−	97.52 ± 6.81
	NH4+	85.61 ± 0.52
	Cl−	1.85 ± 0.41
Carbon	OC	44.09 ± 0.32
	EC	25.51 ± 0.75
	OC/EC	1.72 ± 0.65