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. Author manuscript; available in PMC: 2013 Jul 22.
Published in final edited form as: Sci Total Environ. 2011 Jul 1;409(15):2942–2950. doi: 10.1016/j.scitotenv.2011.04.021

Fig. 1.

Fig. 1

Scatter plots of ambient air PAH concentrations and PAH emission density in spring, summer, fall and winter. TP15 on the Y-axis represents the total PAH concentration (sum of gas-phase and particulate-phase concentrations of the 15 PAHs). P15 on the X-axis represents the emission density of the 15 PAHs.