Table 5.

Variance % and scores of the five components obtained by the PCA performed on the concentration data of PFCs

	PC1	PC2	PC3	PC4	PC5
% Variance	67.2	14.8	9.4	6.4	2.2
CAI	0.8237	0.4039	1.0749	− 1.8142	− 0.3281
GEN	3.8243	− 2.5266	0.3264	0.4551	0.1880
NES	3.8651	2.3951	− 0.4223	0.6147	0.2132
SAO	− 2.6233	− 0.3942	− 1.7943	− 0.6986	0.6276
TOP	− 4.0950	0.3242	1.6281	0.8107	0.3843
TVN	− 1.7948	− 0.2024	− 0.8127	0.6324	− 1.0851