DOI: 10.1016/j.atmosenv.2019.117067
论文题名: Laboratory evaluation of low-cost PurpleAir PM monitors and in-field correction using co-located portable filter samplers
作者: Tryner J. ; L'Orange C. ; Mehaffy J. ; Miller-Lionberg D. ; Hofstetter J.C. ; Wilson A. ; Volckens J.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 220 语种: 英语
英文关键词: 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
学科: Air pollution
; Air quality
; Particulate matter
; Plantower
; Ultrasonic personal aerosol sampler
; UPAS
中文摘要: 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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/161122
Appears in Collections: 气候变化与战略
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作者单位: 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