柴油发动机机龄与校车细颗粒物浓度

Air Pub Date : 2024-07-01 DOI:10.3390/air2030013
M. Szyszkowicz
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引用次数: 0

摘要

在这项研究中,我们研究并评估了柴油发动机的使用年限对校车内细微颗粒物(PM2.5)水平的潜在影响。空气污染物的浓度受多种因素的影响,包括校车及其发动机的技术特性、使用的燃料类型、通勤时间长短、天气条件和周围空气污染情况。在上下学途中,校车在道路上的行为也很重要。这包括公交车在车流中的位置、停靠站点的数量、上车程序以及车门和车窗的打开情况。收集数据的方式是在学生上下学途中陪伴他们,以公交车上下学途中为抽样单位。采用半参数回归法评估 PM2.5 浓度与巴士发动机年龄之间的联系。结果表明,巴士发动机的使用年限与巴士内的 PM2.5 浓度在统计上有显著的正相关。在学校上车时的细颗粒物浓度也与发动机机龄有关,这表明巴士怠速会影响 PM2.5 浓度。在校门口上车前的前两分钟和在校车内的前两分钟,PM2.5 浓度分别为 26.3 和 40.3 μg/m3 。这项研究的结果突出了巴士发动机机龄对 PM2.5 浓度的影响,显示 PM2.5 浓度随着发动机机龄的增加而增加。不过,随着巴士行驶时间的增加,这种影响变得不那么明显。
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Diesel Engine Age and Fine Particulate Matter Concentrations in School Buses
In this study, we examine and assess the potential impact of diesel engine age on the levels of fine particulate matter (PM2.5) in school buses. The concentration of air pollutants is influenced by several factors, including the technical characteristics of the bus and its engine, the type of fuel used, the length of the commute, the weather conditions, and the ambient air pollution. The behavior of the bus on the road, during the commute to and from school, is also important. This includes its position in traffic, the number of bus stops, boarding procedures, as well as the opening of doors and windows. Data were collected by accompanying a student during their commute to and from school, with bus commutes serving as the sampling unit. A semi-parametric regression was applied to assess the link between the PM2.5 concentration and the bus engine age. It was demonstrated that the bus engine age has a statistically significant positive correlation with the PM2.5 concentration inside the bus. The fine particulate matter concentrations during boarding at the school also depend on the engine age, indicating that bus idling affects the PM2.5 concentration. In the first two minutes before boarding in front of the school and the first two minutes inside the bus, the PM2.5 concentrations were 26.3 and 40.3 μg/m3, respectively. The findings of this study highlight the impact of bus engine age on the PM2.5 concentration, showing that the PM2.5 concentration increases with the engine age. However, the effect becomes less visible as the duration of the bus ride increases.
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Air
Air
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