Abstract
PM2.5 samples were simultaneously collected in the urban and suburban roadside environments during different traffic flow periods at Qingdao, a coastal city located in China. The composition, diurnal variation, sources, and toxicity of PAHs, NPAHs, and OPAHs in PM2.5 were analyzed to discuss the influence of vehicle emissions on the pollution characteristics of these components. The concentrations of PAHs, NPAHs, and OPAHs in the suburban site were slightly higher than those at the urban site, and the concentrations in winter were about four times higher than those in summer. For PAHs and NPAHs, in urban site, morning rush hours and evening rush hours were the two periods with the highest concentrations compared with other sampling periods, which were consistent with the heavy traffic times. However, in the suburban site, the highest concentration peak appeared in the morning rush hours and the second highest peak appeared at night. Three major sources including coal combustion, gasoline vehicles emissions, and diesel vehicles emissions were identified by PMF. Among these three sources, gasoline vehicle emissions contributed the most in summer and coal combustion contributed the highest fraction in winter. Although the number of diesel vehicles passing through the sampling sites was much less than that of gasoline vehicles, the contribution of diesel vehicles emissions was comparable to that of gasoline vehicles, which indicates that more attention should be paid to the governance of diesel vehicles to reduce the pollution of PAHs and their derivatives in the roadside environments. Traffic sources have a great impact on the toxicity of PAHs and NPAHs.
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The authors want to thank the support from National Natural Science Foundation of China and the Key research and development project of Shandong Province.
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This work was supported by National Natural Science Foundation of China (Nos. 21577079 and 21307074) and the Key research and development project of Shandong Province (2020CXGC011402).
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Tong Zhao: Conceptualization, Methodology, Visualization, Investigation, Data curation, Writing-Original Draft; Shengzeng Li: Formal Analysis, Writing-Review & Editing; Houyong Zhang: Formal Analysis; Qi Huang: Methodology, Formal Analysis; Anan Qi: Formal Analysis; Wan Zhang: Formal Analysis; Hongliang Gao: Formal Analysis; Shengfei Duan: Formal Analysis; Wenxing Wang: Supervision, Writing-Review & Editing; Lingxiao Yang: Supervision, Validation, Project administration, Funding acquisition, Writing-Review & Editing.
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Zhao, T., Li, S., Zhang, H. et al. Investigation of PM2.5-bound Polycyclic aromatic hydrocarbons (PAHs) and their derivatives (nitrated-PAHs and oxygenated-PAHs) in the roadside environment at the eastern coastal region of China: characterization, source identification, and toxicity evaluation. Air Qual Atmos Health 16, 1257–1270 (2023). https://doi.org/10.1007/s11869-023-01339-8
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DOI: https://doi.org/10.1007/s11869-023-01339-8