Element	Factor
Element	1	2	3	4
BC	0.795	−0.235	−0.272	0.322
Al	0.013	0.155	0.816	0.232
S	0.108	0.002	0.385	0.844
Cl	0.795	0.101	0.241	0.448
K	0.043	0.338	0.616	0.613
Ca	0.185	−0.229	0.838	0.253
Cr	0.303	0.211	0.163	0.834
Mn	0.804	0.395	0.167	−0.052
Fe	0.475	0.557	0.611	0.075
Ni	0.349	0.784	0.064	0.327
Cu	0.713	0.490	0.095	0.181
Zn	0.003	0.949	0.056	0.093
Zr	0.713	0.143	0.313	0.125
Pb	0.627	0.656	−0.058	−0.100
% of variance	27.18	21.23	18.37	17.06
Cumulative %	27.18	48.42	66.79	83.85
Source	Industrial activities and Non−exhaust emissions	Industrial processes	Mineral dust	Waste combustion