globalchange  > 气候变化与战略
DOI: 10.1016/j.atmosenv.2019.117067
Title:
Laboratory evaluation of low-cost PurpleAir PM monitors and in-field correction using co-located portable filter samplers
Author: Tryner J.; L'Orange C.; Mehaffy J.; Miller-Lionberg D.; Hofstetter J.C.; Wilson A.; Volckens J.
Source Publication: Atmospheric Environment
ISSN: 1352-2310
Publishing Year: 2020
Volume: 220
Language: 英语
Keyword: Aerosols ; Air pollution ; Air quality ; Costs ; Laboratories ; Aerosol sampler ; Fine particulate matter (PM2.5) ; Laboratory evaluation ; Particulate Matter ; Plantower ; Reference concentration ; Tapered element oscillating microbalances ; UPAS ; Particles (particulate matter) ; aerosol ; air quality ; atmospheric pollution ; concentration (composition) ; correction ; filter ; interlaboratory comparison ; laboratory method ; particulate matter ; relative humidity ; sample preparation ; sampler ; aerosol ; air monitoring ; air pollution ; air sampling ; Article ; concentration (parameter) ; controlled study ; environmental parameters ; gravimetry ; humidity ; measurement accuracy ; particulate matter ; priority journal ; salt lake ; statistical model ; tapered element oscillating microbalance ; United States ; urban area ; weather ; Colorado ; Fort Collins ; United States
Subject Area: Air pollution ; Air quality ; Particulate matter ; Plantower ; Ultrasonic personal aerosol sampler ; UPAS
Abstract: Low-cost aerosol monitors can provide more spatially- and temporally-resolved data on ambient fine particulate matter (PM2.5) concentrations than are available from regulatory monitoring networks; however, concentrations reported by low-cost monitors are sometimes inaccurate. We investigated laboratory- and field-based approaches for calibrating low-cost PurpleAir monitors. First, we investigated the linearity of the PurpleAir response to NIST Urban PM and derived a laboratory-based gravimetric correction factor. Then, we co-located PurpleAirs with portable filter samplers at 15 outdoor sites spanning 3 × 3-km in Fort Collins, CO, USA. We evaluated whether PM2.5 correction factors calculated using ambient relative humidity data improved the accuracy of PurpleAir monitors (relative to reference filter samplers operated at 16.7 L min−1). We also (1) evaluated gravimetric correction factors derived from periodic co-locations with portable filter samplers and (2) compared PM2.5 concentrations measured using portable and reference filter samplers. Both before and after field deployment, a linear model relating NIST Urban PM concentrations reported by a tapered element oscillating microbalance and PurpleAir monitors (“PM2.5 ATM”) had R2 = 99%; however, an F-test identified a significant lack of fit between the model and the data. The laboratory-based correction did not translate to the field. Over a 35-day period, time-averaged ambient PM2.5 concentrations and RHs measured during 72- or 48-h filter samples ranged from 1.5 to 8.3 μg m−3 and 47%–77%, respectively. Corrections calculated using ambient RH data increased the fraction of time-averaged PurpleAir PM2.5 concentrations that were within 20% of the reference concentration from 24% (for uncorrected measurements) to 66%. Corrections derived from monthly, weekly, and concurrent in-field co-locations with portable filter samplers increased the fraction of time-averaged PurpleAir PM2.5 concentrations that were within 20% of the reference to 46%, 54%, and 72%. PM2.5 concentrations measured using portable filter samplers were within 20% of the reference for 69% of samples. © 2019 Elsevier Ltd
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被引频次[WOS]:9   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/161122
Appears in Collections:气候变化与战略

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Affiliation: Department of Mechanical Engineering, Colorado State University, 1374 Campus Delivery, Fort Collins, CO 80523, United States; Access Sensor Technologies, 2401 Research Blvd, Suite 107, Fort Collins, CO 80526, United States; Department of Statistics, Colorado State University, 1801 Campus Delivery, Fort Collins, CO 80523, United States

Recommended Citation:
Tryner J.,L'Orange C.,Mehaffy J.,et al. Laboratory evaluation of low-cost PurpleAir PM monitors and in-field correction using co-located portable filter samplers[J]. Atmospheric Environment,2020-01-01,220
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