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Risk evaluation of particle-bound polycyclic aromatic hydrocarbons (pPAHs) at roadside air environment in Bangkok by time-series analysis and its application to urban traffic management

曼谷路边空气环境中颗粒多环芳烃（pPAHs）的时间序列分析风险评估及其在城市交通管理中的应用

基本信息

批准号：
14404007
负责人：
YAMAMOTO Kazuo
金额：
$ 7.42万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

Continuous monitoring of pPAHs (particle-bound polycyche aromatic hydrocarbons) by using PAS (photoelectron aerosol sensor) at three roadside monitoring stations and two general stations with a permission by Pollution Control Department (PCD), Thailand for one month in April (dry seasons) this year. Comparing the results obtained in last September (rainy season), the concentration level was unexpectedly low. This was not due to the traffic amount change but mainly due to the difference in seasonal pattern of wind direction. Furthermore, particles were separately collected by a size-wise particle collector and twelve PAHs to which the unit cancer risk is respectively given, such as benzo(a)pyrene, were analyzed by a GC/MS. The particle-wise PAH composition was clearly changed at the particle size of 1μm, judging from the result of cluster analysis. The composition of PAHs of particles at above 1μm was different between the dry season and the rainy season. This is probably due to an increase in lower molecule-size PAHs by a decrease in particle residence time in air environment by a periodical shower in the rainy season. In addition, the unit emission of PAHs from different type of vehicles (16 heavy duty vehicles and 12 light duty vehicles) at a standard driving mode in Thailand, was measured at a PCD laboratory. This was done in collaboration with Dr.Tassanee, Chulalonkorn University. By using our field survey results and presently available data, different scenarios of modal shift, regulation of vehicle type, and so on, was evaluated in the light of risk reduction of PAHs exposure, giving an idea of the way for traffic management. These results was summarized in the final report.

经泰国污染控制部（PCD）批准，在今年4月（旱季）的一个月内，在三个路边监测站和两个一般监测站使用PAS（光电子气溶胶传感器）连续监测pPAH（颗粒结合多环芳烃）。与去年9月（雨季）的结果相比，浓度水平出乎意料地低。这并不是因为交通量的变化，而主要是由于风向的季节性模式不同。此外，颗粒分别收集的颗粒，并分别给予单位癌症风险，如苯并（a）芘，12个多环芳烃，通过GC/MS分析。从聚类分析的结果来看，颗粒的PAH组成明显改变的粒径为1μm。1μm以上颗粒物中多环芳烃的组成在旱季和雨季存在差异。这可能是由于在雨季的周期性阵雨减少了颗粒物在空气环境中的停留时间，从而增加了低分子尺寸的多环芳烃。此外，从不同类型的车辆（16重型车辆和12轻型车辆）在泰国的标准驾驶模式的多环芳烃的单位排放量进行了测量，在PCD实验室。这是与朱拉隆功大学的塔萨尼博士合作完成的。利用现场调查结果和现有数据，从降低多环芳烃暴露风险的角度对交通方式转换、车辆类型调整等不同方案进行了评价，为交通管理提供了思路。这些结果总结在最终报告中。