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On particulate emissions from moving trains in a tunnel environment

机译：关于隧道环境中行驶中的火车的颗粒物排放

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摘要

Increasing attention is being paid to airborne particles in railway environments because of their potential to adversely affect health. In this study, we investigate the contribution of moving trains to both the concentration and size distribution of particles in tunnel environments. Real-time measurements were taken with high time-resolution instruments at a railway station platform in a tunnel in Stockholm in January 2013. The results show that individual trains stopping and starting at the platform substantially elevate the particulate concentrations with a mobility diameter greater than 100 nm. Two size modes of the particulate number concentrations were obtained. A mode of around 170 nm occurs when a train moves, while the other mode peaks at about 30 nm when there is no train in the station. By using principal component analysis (PCA), three contributing sources were identified on the basis of the classification of the sizes of the particles, namely railway-related mechanical wear, suspension due to the movement of trains and sparking of electric-powered components. It is concluded that the particulate matter released by individual moving trains is a key contributor to fine particles (100-500 nm) on the railway platform in a tunnel.
机译：由于铁路环境中的空气传播颗粒会对健康产生不利影响，因此人们越来越关注这些颗粒。在这项研究中，我们研究了移动列车对隧道环境中颗粒物的浓度和尺寸分布的贡献。 2013年1月，在斯德哥尔摩的一个隧道的火车站平台上使用高分辨率的仪器进行了实时测量。结果显示，停在平台​​上的各个列车大大提高了微粒的浓度，其迁移直径大于100纳米获得了两种尺寸模式的颗粒数浓度。火车移动时会出现约170 nm的模式，而车站中没有火车时，其他模式会在约30 nm处达到峰值。通过使用主成分分析（PCA），根据颗粒尺寸的分类，确定了三个促成因素，即铁路相关的机械磨损，火车运动引起的悬挂和电动组件的火花。得出的结论是，各个行驶的列车释放的颗粒物是隧道中铁路平台上的细颗粒（100-500 nm）的关键因素。

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