Field and laboratory evaluation of PurpleAir low-cost aerosol sensors in monitoring indoor airborne particles
Field and laboratory evaluation of PurpleAir low-cost aerosol sensors in monitoring indoor airborne particles
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DOI：
10.1016/j.buildenv.2023.110127
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发表时间：
2023-02
影响因子：
7.4
通讯作者：
Seongjun Park;Shinhye Lee;M. Yeo;Donghyun Rim
中科院分区：
文献类型：
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作者：
Seongjun Park;Shinhye Lee;M. Yeo;Donghyun Rim
由于住宅空气污染物对健康的不利影响，人们加大了使用低成本传感器监测室内颗粒物（PM）浓度的努力。然而，关于低成本传感器在监测室内气溶胶方面的性能的信息很少。我们建立了一个研究框架，以检查在美国广泛使用的低成本传感器（PurpleAir）以及两个研究级光散射传感器（Grimm 11-A, Sidepak AM520）在实验室室和全尺寸住宅测试台上的性能。结果表明，低成本传感器可以获得相对较高的模型内质量浓度一致性；然而，当测量颗粒>.1 μm时，一致性低于研究级传感器。用研究级传感器进行的回归分析表明，质量浓度的线性度高于数量浓度。这些质量和数量浓度的趋势可能归因于Plantower PMS5003传感器在PurpleAir中的尺寸选择性，它限制了特定粒径箱的数量分数。结果还表明，低成本传感器与研究级传感器之间的浓度差异随着室内质量浓度的增加而增加，这表明对于导致pm2.5浓度升高（bbb100 μg m−3）的偶发性室内排放事件，传感器的质量需要保证。
Due to the adverse health effects of residential air contaminants, there have been increased efforts to monitor indoor particulate matter (PM) concentration using low-cost sensors. However, little information is available about the performance of low-cost sensors in monitoring indoor aerosols. We established a research framework to examine the performance of a widely used low-cost sensor in the U.S. (PurpleAir) along with two research-grade light scattering sensors (Grimm 11-A, Sidepak AM520) in a laboratory chamber and a full-scale residential testbed. The results show that low-cost sensors can yield relatively high intra-model consistency for mass concentrations; however, the consistency is lower when measuring particles >1 μm than research-grade sensors. Regression analysis with research-grade sensors shows higher linearity for mass concentration than number concentration. These trends of mass and number concentrations are likely attributed to the size selectivity of Plantower PMS5003 sensor in PurpleAir that constrains the number fractions of specific particle size bins. The results also show that concentration discrepancy between the low-cost sensor and research-grade sensor increases as indoor mass concentration increases, suggesting that sensor quality assurance is needed for episodic indoor emission events that lead to elevated PM2.5concentrations (>100 μg m−3).