Laboratory evaluation of low-cost PurpleAir PM monitors and in-field correction using co-located portable filter samplers

Details

• Journal Title:
  Atmospheric Environment
• Personal Author:
  Tryner, Jessica ; L'Orange, Christian ; Mehaffy, John ; Miller-Lionberg, Daniel ; Hofstetter, Josephine C. ; Wilson, Ander ; Volckens, John
• Description:
  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.
• Keywords:
  Aerosols Environmental Monitoring Environmental Monitoring
• Source:
  Atmospheric Environment, 220
• DOI:
  https://doi.org/10.1016/j.atmosenv.2019.117067
• Document Type:
  Journal Article
• Funding:
  Grant no. 1305M218CNRMW0048
• Rights Information:
  Accepted Manuscript
• Compliance:
  Submitted
• Main Document Checksum:
  urn:sha-512:62d5255a87d641b7f363337bc60ff8d2ec186aaf5c724c736a0a0e696ed8908e87ada3cdda984a6424d6b3dfef2201a79d7b22bc8f848cdbfc26656e0cb51a91
• Download URL:
  https://repository.library.noaa.gov/view/noaa/27288/noaa_27288_DS1.pdf
• File Type:
  [PDF - 1.25 MB ]