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. Author manuscript; available in PMC: 2013 Sep 23.
Published in final edited form as: Indoor Air. 2009 Jul 31;20(1):17–30. doi: 10.1111/j.1600-0668.2009.00620.x

Figure 1.

Figure 1

Figure 1

Outdoor concentrations of a) PAH’s, b) Hopanes and Steranes, c) n-Alkanes and d) Acids. The presented values are average concentrations across all sites and error bars are standard deviation of these averages at each site.