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Impact of traffic Emissions on Local Air Quality and the Potential Toxicity of traffic-related Particulates in Beijing, China

引用

Biomedical and Environmental Sciences 2012年第6期25卷 663-671页

作者： TIAN Lei ZHANG Wei LIN Zhi Qing ZHANG Hua Shan XI Zhu Ge CHEN Jian Hua WANG Wei Laboratory for Environmental and Food Safety Risk Monitoring Technology Institute of Health and EnvironmentalMedicine Tianjin 300050 China Chinese Academy of Environmental Sciences Beijing 100012 China

Objective Air-borne particulates from different sources could have different physicochemical properties and inflammatory potentials. This study aims to characterize the chemical compositions and the toxicity of ambient particulate matter （pm） associated with traffic emissions. Methods The concentrations of trace elements, organic carbon （OC）, elemental carbon （EC） and polycyclic aromatic hydrocarbons （pahs） in pm2.5 and pmlo were measured in samples collected at sites in Beijing, China. Their toxic effects on the pulmonary system of rats were investigated. Biochemical parameters （LDH, T-AOC, TP） and inflammatory cytokine（IL-6, IL-1, TNF-a） levels were measured in the lungs of rats exposed to traffic-related pm. Oxidative damage was observed. pm samples were taken from a near road site and an off road site in summer time in 2006. Results The concentrations of the USEPA priority pollutant pahs in both pmlo and pm2.s were higher （299.658 and 348.412） at the near road site than those （237.728 and 268.472） at the off road site. The similar trend was observed for the concentrations of trace elements in pm. Compared to coarse particles （pm^0）, fine particles （pm2.s） have a greater adsorption capacity to enrich toxic elements than inhalable particles. Decrease in antioxidant capacity and an increase in the amount of lipid peroxidation products in rat lung tissues was observed. Conclusion The findings of the present study suggest that the differing inflammatory responses of pm collected from the two road sites might have been mediated by the differing physicochemical characteristics.

关键词： traffic-related pm, pahs Trace elements Pulmonary toxicity

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