《Table 2–Diagnostic ratios.》

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《"PM_(2.5)-bound polycyclic aromatic hydrocarbons(PAHs) in Beijing:Seasonal variations,sources,and risk assessment"》

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As summarized in Table 2，most of the BaP/BghiP ratios in both cold and warm months were>0.6，indicating the dominance of traffic emission.And most of the BaP/（BaP+Chr）ratios in the two seasons were<0.5，representing the main role of diesel vehicles.Fig.2 shows the scatter ratio-ratio plot for Flu/（Flu+Pyr）vs.BaA/（BaA+Chr）and IcdP/（IcdP+BghiP）vs.BaA/（BaA+Chr）.As shown in Fig.2a，most of Flu/（Flu+Pyr）ratios were between 0.5 and 0.6，with BaA/（BaA+Chr）between 0.35and 0.6 in the cold months.In the warm months，most of Flu/（Flu+Pyr）ratios were between 0.5 and 0.6 with BaA/（BaA+Chr）between 0.2 and 0.35.In Fig.2b，most of IcdP/（IcdP+BghiP）ratios were higher than 0.5 in the cold months with significant reduction in the warm months.Both two plots indicated that vehicle emission，coal and biomass burning were the primary sources of PAHs.