Ultrafine Particles on Electric, Gas, and Diesel Buses in the Mass Transit Buses of Bogotá, Colombia

Diego Armando Vargas Romero, Cristina Vanesa Durán Grados
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Abstract

The concentration of traffic-related air pollutants (TRAPs) inside transport microenvironments takes on relevance today in many megacities with high population density, intense traffic, and prolonged travel times. These conditions can intensify exposure to TRAPs and worsen public health problems. TRAP concentrations in these microenvironments are changing because of the introduction of cleaner technologies. In this study, we compare the ultrafine particles measured inside diesel, gas, and electric buses during their normal operation in Bogotá, Colombia. We used a miniature diffusion size classifier (DiSCmini) to measure ultrafine particle concentrations, average particle size, and the lung-deposited surface area. Our results revealed significantly lower levels of this pollutant inside electric buses. The concentration of ultrafine particles per cubic centimeter is about 41% and 27% lower in electric buses compared to diesel and gas, respectively. The lung-deposited surface area is also lower in electric buses. Nevertheless, the average particle size in electric buses is 10% and 18% smaller compared to diesel and gas, respectively.
哥伦比亚波哥大公交车上的电动公交车、燃气公交车和柴油公交车上的超细粒子
交通微环境中与交通有关的空气污染物(TRAPs)的浓度在当今许多人口密度高、交通繁忙和旅行时间长的大城市中具有重要意义。这些情况会加剧暴露于 TRAPs 的程度,使公共健康问题恶化。由于采用了更清洁的技术,这些微环境中的 TRAP 浓度正在发生变化。在这项研究中,我们比较了在哥伦比亚波哥大正常运行的柴油、燃气和电动公交车内测得的超细粒子。我们使用微型扩散粒度分类器(DiSCmini)测量了超细粒子浓度、平均粒度和肺沉积表面积。我们的结果表明,电动公交车内的这种污染物含量明显较低。与柴油车和天然气车相比,电动公交车内每立方厘米的超细颗粒浓度分别降低了约 41% 和 27%。电动公交车的肺沉积表面积也较低。不过,电动巴士的平均颗粒大小比柴油和燃气巴士分别小 10%和 18%。
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