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. Author manuscript; available in PMC: 2009 Jul 20.
Published in final edited form as: J Hazard Mater. 2008 Jul 26;163(2-3):946–958. doi: 10.1016/j.jhazmat.2008.07.089

Fig. 8.

Fig. 8

Relative concentration values of PAHs in samples from each category of sampling sites based on the size of PAHs. PAHs were grouped into two- to six-ring compounds. All sites (except for those from agricultural area) contain greater than 50% of the PAHs of four-ring or higher, which indicates a dominance of combustion sources.