气候变化领域集成服务门户(CCPortal): One year evaluation of three low-cost PM2.5 monitors

CCPortal

DOI	10.1016/j.atmosenv.2020.117615
	One year evaluation of three low-cost PM2.5 monitors
	Zamora M.L.; Rice J.; Koehler K.
发表日期	2020
ISSN	1352-2310
卷号	235
英文摘要	The availability of low-cost monitors marketed for use in homes has increased rapidly over the past few years due to the advancement of sensing technologies, increased awareness of urban pollution, and the rise of citizen science. The user-friendly packages can make them appealing for use in research grade indoor exposure assessments, but a rigorous scientific evaluation has not been conducted for many monitors on the open market, which leads to uncertainty about the validity of the data. Furthermore, many previous sensor studies were conducted for a relatively short period of time, which may not capture the changes this type of instrument may exhibit over time (known as sensor aging). We evaluated three monitors (AirVisual Pro, Speck, and AirThinx) in an occupied, non-smoking residence over a 12-month period in order to assess the sensors, the built-in calibrations, and the need for additional data to achieve high accuracy for long deployments. Two units of each type of monitor were evaluated in order to assess the precision between units, and a personal DataRAM (pDR-1200) with a filter was placed in the home for about 20% of the sampling period (e.g., about a week each month) to evaluate the accuracy over time. The average PM2.5 mass concentration from the periods of colocation with the pDR were 5.31 μg/m3 for the gravimetric-corrected pDR (hereafter pDR-corrected), 5.11 and 5.03 μg/m3 for the AirVisual Pro units, 13.58 and 22.68 μg/m3 for the Speck units, and 7.56 and 7.57 μg/m3 for the AirThinx units. The AirVisual Pros exhibited the best accuracy compared to the filter at about 86%, which was slightly better than the nephelometric component of the pDR compared to the filter weight (84%). The accuracies of the Speck (−174 and −405%) and AirThinx (42 and 40%) monitors were much lower. When the 1-min averaged PM2.5 mass concentrations were categorized by air quality index (AQI), the pDR-corrected matched the AirVisual Pro, Speck, and AirThinx bins about 97, 40, and 87% of the time, respectively. The Pearson correlation coefficients (R2) between the unit pairs and the pDR were 0.90/0.90, 0.50/0.27, and 0.92/0.93 for the AirVisual Pro, Speck, and AirThinx units, respectively. The R2 between units of the same type were 0.99, 0.17, and 1.00 for the AirVisual Pro, Speck, and AirThinx, respectively. All of the monitors could achieve better accuracy by adding filter corrections and post-processing to correct for known biases in addition to the manufacturer's correction routine. Monthly calibrations yielded the highest accuracies, but nearly as high of accuracies could be achieved with only one or two calibrations for the Air Visual Pro and the AirThinx for many applications. In general, this type of new low-cost monitor shows exciting potential for use in scientific research. However, only one of the three monitors exhibited high accuracy (within 20% of the true mass concentration) without any post processing or additional measurements, so an evaluation of each monitor is essential before the data can be used to confidently evaluate residential exposures. © 2020
英文关键词	AirThinx; AirVisual pro; Indoor air; Indoor exposures; Low-cost sensors; PM2.5; Pollution; Speck
语种	英语
scopus关键词	Air quality; Correlation methods; Additional datum; Air quality indices; Built-in calibration; Mass concentration; Pearson correlation coefficients; Scientific evaluations; Scientific researches; Sensing technology; Costs; accuracy assessment; air quality; atmospheric correction; calibration; concentration (composition); environmental monitoring; particulate matter; pollution exposure; precision
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129421
作者单位	Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, 615 N. Wolfe St., Baltimore, MD 21205, United States; Department of Pediatrics, Pediatric Pulmonology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
推荐引用方式 GB/T 7714	Zamora M.L.,Rice J.,Koehler K.. One year evaluation of three low-cost PM2.5 monitors[J],2020,235.
APA	Zamora M.L.,Rice J.,&Koehler K..(2020).One year evaluation of three low-cost PM2.5 monitors.Atmospheric Environment,235.
MLA	Zamora M.L.,et al."One year evaluation of three low-cost PM2.5 monitors".Atmospheric Environment 235(2020).