Using Low-cost Sensors to Quantify the Effects of Air Filtration on Indoor and Personal Exposure Relevant PM2.5 Concentrations in Beijing, China
Using Low-cost Sensors to Quantify the Effects of Air Filtration on Indoor and Personal Exposure Relevant PM2.5 Concentrations in Beijing, China
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DOI：
10.4209/aaqr.2018.11.0394
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发表时间：
2020-02-01
影响因子：
4
通讯作者：
Zhang, Junfeng
中科院分区：
文献类型：
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作者：
Barkjohn, Karoline K.;Bergin, Michael H.;Zhang, Junfeng
受污染城市的居民经常使用室内空气净化器，试图通过减少接触空气污染物来改善健康，尽管很少有研究在相关现场条件下评估这些设备。低成本的空气监测仪越来越多地用于监测空气污染暴露;然而，必须首先在部署地点对其进行校准和评估，以确保测量的准确性和精度。在这项研究中，我们开发了一种两步校准方法，其中一个低成本的监测器校准参考分析仪，然后用于校准其他监测器，缩短所需的校准时间，减少测量误差。我们实验中的监测器测量了中国北京7个家庭在真实和假过滤的1周内的室内、室外和个人暴露PM2.5浓度。平均而言，过滤使室内和个人暴露相关浓度降低了72%（标准差）。呃。= 7%）和28%（标准。呃。= 5%）。然而，这项研究表明，最大限度地减少个人暴露还需要减少室内室外空气的渗透，或减少城市或国家一级的PM2.5污染。
Residents of polluted cities frequently use indoor air purifiers in an attempt to improve their health by reducing their exposure to air pollutants, despite the fact that few studies have assessed these devices under relevant field conditions. Low-cost air monitors are increasingly popular for monitoring air pollution exposure; however, they must be calibrated and evaluated in their deployment location first to ensure measurement accuracy and precision. In this study, we developed a 2-step calibration method in which a low-cost monitor is calibrated against a reference analyzer and is then used to calibrate other monitors, shortening the required calibration time and reducing measurement error. The monitors in our experiment measured indoor, outdoor, and personal exposure PM2.5 concentrations during 1 week each of true and sham filtration in 7 homes in Beijing, China On average, filtration reduced the indoor and personal exposure relevant concentrations by 72% (std. err. = 7%) and 28% (std. err. = 5%), respectively. This study indicates that minimizing personal exposure, however, also requires reducing the infiltration of outdoor air in homes or decreasing PM2.5 pollution at the city or country level.