Yan Caiqing, Zheng Mei, Yang Qiaoyun, Zhang Qunfang, Qiu Xinghua, Zhang Yanjun, Fu Huaiyu, Li Xiaoying, Zhu Tong, Zhu Yifang
State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
Environ Pollut. 2015 Sep;204:199-206. doi: 10.1016/j.envpol.2015.05.001. Epub 2015 May 14.
Exposure to fine and ultrafine particles as well as particulate polycyclic aromatic hydrocarbons (PAHs) by commuters in three transportation modes (walking, subway and bus) were examined in December 2011 in Beijing, China. During the study period, real-time measured median PM2.5 mass concentration (PMC) for walking, riding buses and taking the subway were 26.7, 32.9 and 56.9 μg m(-3), respectively, and particle number concentrations (PNC) were 1.1 × 10(4), 1.0 × 10(4) and 2.2 × 10(4) cm(-3). Commuters were exposed to higher PNC in air-conditioned buses and aboveground-railway, but higher PMC in underground-subway compared to aboveground-railway. PNC in roadway modes (bus and walking) peaked at noon, but was lower during traffic rush hours, negatively correlated with PMC. Toxic potential of particulate-PAHs estimated based on benzo(a)pyrene toxic equivalents (BaP TEQs) showed that walking pedestrians were subjected to higher BaP TEQs than bus (2.7-fold) and subway (3.6-fold) commuters, though the highest PMC and PNC were observed in subway.
2011年12月，在中国北京对三种交通方式（步行、地铁和公交）通勤者接触细颗粒物、超细颗粒物以及颗粒态多环芳烃（PAHs）的情况进行了调查。在研究期间，步行、乘坐公交和地铁时实时测量的PM2.5质量浓度（PMC）中位数分别为26.7、32.9和56.9 μg m(-3)，颗粒数浓度（PNC）分别为1.1×10(4)、1.0×10(4)和2.2×10(4) cm(-3)。与地上铁路相比，通勤者在空调公交车和地上铁路中接触到更高的PNC，但在地下地铁中接触到的PMC比地上铁路更高。道路出行方式（公交和步行）中的PNC在中午达到峰值，但在交通高峰时段较低，与PMC呈负相关。基于苯并(a)芘毒性当量（BaP TEQs）估算的颗粒态PAHs的毒性潜力表明，尽管地铁中观察到最高的PMC和PNC，但步行的行人接触到的BaP TEQs比公交通勤者高2.7倍，比地铁通勤者高3.6倍。
