Evaluation of PM2.5 measured in an urban setting using a low-cost optical particle counter and a Federal Equivalent Method Beta Attenuation Monitor
Evaluation of PM2.5 measured in an urban setting using a low-cost optical particle counter and a Federal Equivalent Method Beta Attenuation Monitor
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DOI：
10.1080/02786826.2019.1619915
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发表时间：
2019-05-30
影响因子：
5.2
通讯作者：
Hauser, Cindy
中科院分区：
文献类型：
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作者：
Magi, Brian I.;Cupini, Calvin;Hauser, Cindy
我们介绍了一种低成本光学粒子计数传感器（Purple Air PA-II）的多季节现场评估结果，该传感器报告直径小于2.5微米（PM2.5）的颗粒物的质量浓度，并且是一个相对较大且不断增长的微电子物联网传感器网络的一部分。我们评估了在北卡罗来纳州夏洛特潮湿气候下的近道路城市环境中收集的16个月的PA-II PM2.5数据。PA-II与联邦等效方法Beta衰减监测器（BAM模型1022）以及监测环境相对湿度（RH）和温度(T)的气象站搭配使用。我们测试并使用多元线性回归模型，BAM PM2.5， RH和T作为预测因子来模拟报告的PA-II PM2.5。结果表明，相对于BAM的参考数据，PA-II PM2.5数据的准确性提高了27-57%，其中中至高RH的百分比提高最大。我们研究中的方法广泛适用于其他低成本监测仪的现场研究，结果是一个关键的改进，表明PA-II可能确实适用于空气质量、健康和城市气溶胶研究。版权所有2019年美国气溶胶研究协会
We present the results of a multi-season field evaluation of a low-cost optical particle counting sensor (Purple Air PA-II) that reports mass concentration of particulate matter with diameter less than 2.5 microns (PM2.5), and is part of a relatively large and growing network of microelectronic internet-of-things sensors. We assessed 16 months of PA-II PM2.5 data collected in a near-road urban setting in the humid climate of Charlotte, North Carolina. The PA-II was collocated with a Federal Equivalent Method Beta Attenuation Monitor (BAM model 1022), and with a weather station that monitored ambient relative humidity (RH) and temperature (T). We tested and used a multiple linear regression model with BAM PM2.5, RH, and T as predictors to model the reported PA-II PM2.5. The results show a 27-57% improvement in the accuracy of the PA-II PM2.5 data relative to the reference data from the BAM, with the highest percentage improvements for moderate to high RH. The methodologies in our study are broadly applicable to other field studies of low-cost monitors, and the results are a critical improvement that suggest that PA-II may indeed be suitable for air quality, health, and urban aerosol research. Copyright (c) 2019 American Association for Aerosol Research