• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aerosol and Air Quality Research >Comparisons of PM10, PM2.5, Particle Number, and CO2 Levels inside Metro Trains between Traveling in Underground Tunnels and on Elevated Tracks
【24h】

Comparisons of PM10, PM2.5, Particle Number, and CO2 Levels inside Metro Trains between Traveling in Underground Tunnels and on Elevated Tracks

机译：在地下隧道和高架轨道上行驶之间地铁列车中PM10，PM2.5，颗粒数和CO2含量的比较

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Commuters spend considerable time, in some cases up to 1–2 h a day, traveling in metro trains. However, few studies have compared air quality between trains traveling above-ground and underground. This study measures the PM10, PM2.5, particle number (PN) and CO2 levels inside metro trains traveling in underground tunnels and on elevated tracks on a metro line in the Taipei metro system. The results demonstrated that PM10, PM2.5 and CO2 levels inside metro trains traveling in underground environments are approximately 20–50% higher than those in above-ground environments. However, PN levels inside metro trains traveling in underground environments are approximately 20% lower than those in above-ground ones. These measurement results reveal that levels of pollutant species inside the metro trains are significantly affected by traveling environmental conditions––in underground tunnels or on elevated tracks. Moreover, the levels of pollutant species inside the metro trains traveling on the same route are also different in different traveling directions. Fine PM inside the metro trains is transferred from the outside and significantly influenced by the surrounding conditions of the trains. Additionally, a high fraction of large coarse PM (> 10 μm) is observed inside the metro trains, possibly due to re-suspension by the movement of commuters. The measurement results show that, unlike PM, which is transferred from outside environments, CO2 inside metro trains is elevated internally by exhalation from commuters. Clearly, CO2 exhaled by commuters could accumulate inside metro trains and, compared to PM, is not as easily removed by the ventilation system when air circulation does not provide enough fresh air in the metro trains, particularly in trains traveling in underground environments.
机译：通勤者每天花费相当多的时间乘坐地铁列车，有时长达1-2小时。但是，很少有研究比较地面和地下列车的空气质量。这项研究测量了台北地铁系统中地下隧道和高架轨道上运行的地铁列车中的PM10，PM2.5，颗粒数（PN）和CO2水平。结果表明，在地下环境中行驶的地铁列车中的PM10，PM2.5和CO2含量比地上环境中的高约20–50％。但是，在地下环境中行驶的地铁列车中的PN含量比地上火车中的PN含量低约20％。这些测量结果表明，地铁列车内或地下高架轨道上行驶的环境条件对地铁列车内污染物种类的水平有很大影响。此外，在同一路线上行驶的地铁列车内的污染物种类水平在不同的行驶方向上也有所不同。地铁列车内部的精细PM是从外部传递的，并且受列车周围环境的影响很大。此外，在地铁列车内观察到很大一部分较大的粗颗粒PM（> 10μm），这可能是由于通勤者的运动造成的重新悬浮。测量结果表明，与从外部环境转移的PM不同，地铁列车内部的CO2通过通勤者的呼气而在内部升高。显然，通勤者呼出的二氧化碳可能积聚在地铁列车内，并且与PM相比，当空气流通无法在地铁列车中提供足够的新鲜空气时，尤其是在地下环境中行驶的列车中，通气系统不易通过通风系统清除二氧化碳。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号