Influence of traffic conditions on polycyclic aromatic hydrocarbon abundance in street dust.
Polycyclic aromatic hydrocarbon (PAH) concentrations were quantified in sieved street dusts from eight sampling sites with different traffic conditions in Beijing. The parent diagnostic ratio test and multi-regression analysis were used to identify the different PAH pollution sources. Results showed that more than 93% of the cumulative 16 priority pollutant PAHs (Sigma 16EPA-PAH) load was present in street dust with a diameter less than 300 microm across all the sampling sites. The concentration of Sigma 4-6 ring PAHs was 93 to 284% higher than that of Sigma 2-3 ring PAHs for most of the sites except the cycle lane site, indicating the dominance of pyrogenic inputs in street dusts at these sites. Cooking oil is an important PAH source in street dusts for all the sampling sites. Tire debris and vehicle emissions were also identified as significant contributors to the PAH loading in the heavy traffic zone, vehicle parking areas, the frequent brake usage zone, and the construction area.
Xiang
Li
L
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, China.
Li
Yingxia
Y
Yang
Zhifeng
Z
Shi
Jianghong
J
D002681:China; D004391:Dust / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D015999:Multivariate Analysis; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D001335:Vehicle Emissions / Q000032:analysis*
D004391:Dust; D011084:Polycyclic Aromatic Hydrocarbons; D001335:Vehicle Emissions