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Schoolchildren’s exposure to PM2.5: a student club–based air quality monitoring campaign using low-cost sensors
Air Quality, Atmosphere & Health ( IF 2.9 ) Pub Date : 2020-04-04 , DOI: 10.1007/s11869-020-00815-9
L.-W. Antony Chen , John O. Olawepo , Felicia Bonanno , Aman Gebreselassie , Mi Zhang

To assess schoolchildren’s exposure to outdoor/indoor air pollution and identify those at a higher risk, it is desirable to conduct personal-level air quality monitoring. This paper documents a 2-month voluntary monitoring campaign with students attending the environmental club of the Spring Valley High School in urban Las Vegas, Nevada. The students wore low-cost sensors to log their exposure to PM2.5 (particulate matter with aerodynamic diameters < 2.5 μm) at 5-min temporal resolution throughout the school hours. Calibrations of these sensors as well as concurrent outdoor monitors were traceable to the official air monitoring network. On a daily basis, the collective exposure among the students generally tracked the outdoor PM2.5 levels (r2 = 0.55), but the ratio of personal over outdoor exposure (P/O ratio) varied by student, ranging from 1.1 ± 0.6 to 1.9 ± 1.2, consistent with the indoor/outdoor (I/O) ratios for naturally-ventilated classrooms with substantial indoor sources. The personal exposure showed impacts of short-term, acute events, which were not observed outdoors and likely resulted from resuspension of particles due to students’ movements, particularly during class breaks. Such indoor sources could have dominated PM2.5 exposure when outdoor air is clean. Improving air filtration and surface cleaning for the classrooms are recommended to lower students’ exposure to particulate air pollution. The personal monitoring protocol established in this study may be expanded to different pollutants and integrated into many schools’ science curricula to generate much-needed exposure data and increase air quality awareness among schoolchildren.

中文翻译:

学童暴露于 PM2.5:基于学生俱乐部的使用低成本传感器的空气质量监测活动

为了评估学童暴露于室外/室内空气污染的情况并识别那些处于较高风险中的学生,最好进行个人级别的空气质量监测。本文记录了一项为期 2 个月的自愿监测活动,学生参加了内华达州拉斯维加斯市 Spring Valley 高中的环境俱乐部。学生们佩戴低成本传感器,在整个上课时间以 5 分钟的时间分辨率记录他们接触 PM2.5(空气动力学直径 < 2.5 微米的颗粒物)的情况。这些传感器的校准以及同时进行的室外监测器可追溯到官方空气监测网络。每天,学生之间的集体暴露通常跟踪室外 PM2.5 水平(r2 = 0.55),但个人与室外暴露的比率(P/O 比率)因学生而异,范围从 1。1 ± 0.6 至 1.9 ± 1.2,与具有大量室内源的自然通风教室的室内/室外 (I/O) 比率一致。个人暴露显示出短期、急性事件的影响,这些影响在户外未观察到,可能是由于学生的运动,特别是在课间休息时,颗粒重新悬浮所致。当室外空气清洁时,此类室内源可能会影响 PM2.5 的暴露。建议改善教室的空气过滤和表面清洁,以减少学生接触颗粒物空气污染的机会。本研究中建立的个人监测协议可能会扩展到不同的污染物,并整合到许多学校的科学课程中,以生成急需的暴露数据并提高学童的空气质量意识。与具有大量室内源的自然通风教室的室内/室外 (I/O) 比率一致。个人暴露显示出短期、急性事件的影响,这些影响在户外未观察到,可能是由于学生的运动,特别是在课间休息时,颗粒重新悬浮所致。当室外空气清洁时,此类室内源可能会影响 PM2.5 的暴露。建议改善教室的空气过滤和表面清洁,以减少学生接触颗粒物空气污染的机会。本研究中建立的个人监测协议可能会扩展到不同的污染物,并整合到许多学校的科学课程中,以生成急需的暴露数据并提高学童的空气质量意识。与具有大量室内源的自然通风教室的室内/室外 (I/O) 比率一致。个人暴露显示出短期、急性事件的影响,这些影响在户外未观察到,可能是由于学生的运动,特别是在课间休息时,颗粒重新悬浮所致。当室外空气清洁时,此类室内源可能会影响 PM2.5 的暴露。建议改善教室的空气过滤和表面清洁,以减少学生接触颗粒物空气污染的机会。本研究中建立的个人监测协议可能会扩展到不同的污染物,并整合到许多学校的科学课程中,以生成急需的暴露数据并提高学童的空气质量意识。
更新日期:2020-04-04
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