Table 6. Eigenvalues and variance ratios of metals in road dusts.

Principal component	Initial eigenvalues			Extracted eigenvalues			Rotated eigenvalues
	Eigenvalues	% of variance explained	% of cumulative	Eigenvalues	% of variance explained	% of cumulative	Eigenvalues	% of variance explained	% of cumulative
1	4.75	52.82	52.82	4.75	52.82	52.82	3.94	43.82	43.82
2	1.40	15.53	68.35	1.40	15.53	68.35	1.18	13.08	56.90
3	1.09	12.06	80.41	1.09	12.06	80.41	1.15	12.76	69.66
4	0.76	8.44	88.85	0.76	8.44	88.85	1.12	12.40	82.06
5	0.45	4.98	93.83	0.45	4.98	93.83	1.06	11.76	93.83
6	0.34	3.78	97.61
7	0.13	1.47	99.07
8	0.07	0.76	99.83
9	0.02	0.17	100.00