XIONG Xiuqin, LI Yi-xue, ZHAO Ang, WANG Hui, PAN Xiao-chuan. PM2.5 concentrations in subway cars in Beijing and related awareness of subway passengers[J]. Journal of Environmental and Occupational Medicine, 2018, 35(7): 583-588. DOI: 10.13213/j.cnki.jeom.2018.17637
Citation: XIONG Xiuqin, LI Yi-xue, ZHAO Ang, WANG Hui, PAN Xiao-chuan. PM2.5 concentrations in subway cars in Beijing and related awareness of subway passengers[J]. Journal of Environmental and Occupational Medicine, 2018, 35(7): 583-588. DOI: 10.13213/j.cnki.jeom.2018.17637

PM2.5 concentrations in subway cars in Beijing and related awareness of subway passengers

  • Objective To monitor the PM2.5 levels in subway cars in Beijing and compare with the PM2.5 levels outside subway stations, and investigate related awareness and protection in subway passengers.

    Methods A total of 10 subway lines in Beijing were selected. PM2.5 concentrations in subway cars were monitored once a week during the evening rush hours (16:30-20:30) on Friday from October 2016 to April 2017 (except the Spring Festival), and compared with the ambient PM2.5 concentrations at the same time outside subway stations. A questionnaire survey on the awareness and protective actions related to air pollution both inside and outside subways were conducted among subway passengers.

    Results The median of PM2.5 concentration in subway cars of 10 subway lines was 133 μg/m3, much higher than that outside subway stations (61 μg/m3) (P < 0.001). Of the 618 passengers interviewed, only 128 passengers (20.7%) thought that the air pollution was more severe in subway than outside; 449 passengers (72.7%) reported that they would use masks to protect them from air pollution, among which only 96 passengers (21.4%) would wear masks in subway cars in hazy days. There was difference in the proportion of passengers wearing masks among the passengers with different cognition of the air pollution in subway cars (P=0.008). Compared with those who thought the air pollution was more severe outside subway stations (136/340, 40.0%), the passengers who believed that the air pollution was more severe in subway cars had a much lower proportion of "never using masks in subway cars"(19/94, 20.2%).

    Conclusion The concentration of PM2.5 is generally higher in subway cars than in ambient environment during the evening rush hours in Beijing. However, most subway passengers show poor awareness of the fact and do not wear masks in subway cars. Therefore, their awareness of self-protection from air pollution in subway cars needs to be enhanced.

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