Table 3.

Standardized rotated factor loading and communalities from PCA in PM_2.5

Component1		Component2		Component3		Component4		Component5
Metal	Loadings	Metal	Loadings	Metal	Loadings	Metal	Loadings	Metal	Loadings
K	0.955	Cd	0.942	Sb	0.869	Na	0.782	V	0.761
Fe	0.952	Pb	0.825	Co	0.852	Se	-0.638	Mg	0.644
Cr	0.923	Zn	0.804	Ni	0.738	As	-0.562	Al	0.364
Ca	0.880	Sn	0.695	Mo	0.591	Mg	0.427	Ca	0.335
Al	0.862	Mo	0.980	Cu	0.488	Pb	-0.172	Ti	-0.217
Mn	0.808	As	0.578	Zn	0.450	K	0.168	Pb	-0.190
Ti	0.750	Mn	0.519	V	0.366	Cr	-0.155	Se	-0.183
Cu	0.730	Sb	0.374	As	-0.305	Al	0.137	Mo	0.169
Ni	0.627	Cu	0.370	Ca	0.233	Mo	-0.136	Cu	0.144
Co	0.446	Cr	0.268	Mg	-0.186	Co	0.134	K	0.138
Mg	0.333	Se	0.266	Sn	0.185	Fe	0.123	Ni	0.129
Sn	0.282	Ti	-0.229	Fe	0.177	Ca	0.097	As	0.091
V	0.183	Fe	0.163	Mn	0.160	Cd	-0.093	Co	0.089
Na	0.163	V	-0.136	Se	-0.159	V	-0.081	Fe	0.076
Mo	0.161	Ni	-0.104	Ti	0.148	Cu	0.065	Cr	0.051
Zn	0.102	Mg	-0.043	Na	-0.143	Sb	-0.042	Sb	0.041
As	-0.096	Ca	0.036	K	0.096	Ni	0.038	Na	-0.036
Sb	0.056	Co	-0.029	Al	0.082	Ti	0.031	Cd	-0.031
Se	0.053	K	0.023	Cr	0.062	Zn	-0.020	Sn	-0.024
Cd	0.021	Na	0.006	Pb	-0.058	Sn	-0.017	Zn	-0.014
Pb	-0.010	Al	-0.005	Cd	-0.034	Mn	-0.015	Mn	0.008
Eigena	8.51	Eigen	4.25	Eigen	2.10	Eigen	1.20	Eigen	1.00
Varb (%)	42.5	Var (%)	21.3	Var (%)	10.5	Var (%)	5.9	Var (%)	5.0

^aEigen: eigenvalue

^bVar: variance explained