Characterization of PM and Microclimate in a Shanghai Subway Tunnel, China

作者：Ting Qiao, Guangli Xiu, Yi Zheng, Jun Yang, Lina Wang · 发表于：Procedia Engineering · 年份：2015 · DOI：10.1016/j.proeng.2015.01.250 · 被引用次数：22 · 研究领域：Air Quality and Health Impacts、Vehicle emissions and performance、Atmospheric chemistry and aerosols

A real-time monitoring campaign was conducted from November 11 th to November 15 th , 2013 in a Shanghai subway tunnel, consisting of temperature (T), relative humidity (RH) and PM 1 , PM 2.5 and PM 10 . The objective was to characterize PM and microclimate in the subway tunnel. Results indicated that median values of T, RH, PM 1 , PM 2.5 and PM 10 were 29.4°C, 29.6%, 42 μg/m 3 , 46 μg/m 3 and 58 μg/m 3 , respectively. Air quality in the tunnel was comparatively good, with 76% of PM 2.5 and 91% of PM 10 reaching relative standards. Independent samples t-test verified that PM 1 , PM 2.5 and PM 10 presented significant statistical differences between peak hours and off-peak hours (p<0.05). Notable weekly variation emerged during monitoring periods, which of all particles was as following: Friday > Thursday > Monday, Tuesday > Wednesday. Ratios of PM 1 /PM 10 and PM 2.5 /PM 10 were 0.49–1.00 and 0.56–1.00, respectively, which were high in outage and low in operation of trains. This phenomenon might result from plenty of coarse particles generated by mechanical grinding in the process of train driving.