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. 2005 Dec 29;114(5):697–703. doi: 10.1289/ehp.8496

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PCA of PAH and PCB chemical data. Abbreviations: part, particulate; rur, rural sample; urb, urban sample. (A) PAHs; the first two components accounted for 87% of the variance. (B) PCBs; the first two components accounted for 60% of the variance.