Exposure measurement, risk assessment and source identification for exposure of traffic assistants to particle-bound PAHs in Tianjin, China

• Published in: Journal of environmental sciences (China) 2014-02, Vol.26 (2), p.448-457
• Main Authors: Xue, Xiaodan, You, Yan, Wu, Jianhui, Han, Bin, Bai, Zhipeng, Tang, Naijun, Zhang, Liwen
• Format: Article
• Language: English
• Subjects: China; Cities; Computer simulation; Exposure; Humans; Occupational Exposure - analysis; Pollution sources; Polyallylamine hydrochloride; Polycyclic aromatic hydrocarbons; Polycyclic Aromatic Hydrocarbons - analysis; Risk; Risk Assessment; source identification; traffic assistants; Traffic flow; Transportation; 中国北方; 交通; 光测量; 多环芳烃; 天津; 源识别; 颗粒态; 风险评估
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/S1001-0742(13)60427-1

To investigate the levels of exposure to particulate-bound polycyclic aromatic hydrocarbon （PAH） and to estimate the risk these levels pose to traffic assistants （TAs） in Tianjin （a rnegacity in North China）, a measurement campaign （33 all-day exposure samples, 25 occupational-exposure samples and 10 indoor samples） was conducted to characterize the TAs＇ exposure to PAHs, assess the cancer risk and identify the potential sources of exposure. The average total exposure concentration of 14 PAHs was approximately 2871 ＋ 928 ng/rn3 （on-duty）, and 1622 ＋ 457 ng/m3 （all-day）. The indoor PAHs level was 1257 ＋ 107 ng/m3. After 8000 Monte Carlo simulations, the cancer risk resulting from exposure to PAHs was found to be approximately 1.05 x 10-4. A multivariate analysis was applied to identify the potential sources, and the results showed that, in addition to vehicle exhaust, coal combustion and cooking fumes were also another two important contributors to personal PAH exposure. The diagnostic ratios of PAH compounds agree with the source apportionment results derived from principal component analysis.