Design and evaluation of a portable PM2.5 monitor featuring a low-cost sensor in line with an active filter sampler

Environmental Science. Processes & Impacts
Jessica TrynerJohn Volckens

Abstract

Fine particulate air pollution (PM2.5) is a health hazard with numerous indoor and outdoor sources. Versatile monitors are needed to characterize PM2.5 sources, concentrations, and exposures in a range of locations and applications. Whereas low-cost light-scattering PM sensors provide real-time measurements with limited accuracy, gravimetric samples provide more accurate, albeit time-integrated, measurements. When used together, low-cost sensor data can be corrected to gravimetric samples. Here we describe the development of a portable PM2.5 monitor that features a low-cost sensor in line with an active filter sampler. Laboratory tests were conducted to determine (1) the accuracy and precision of PM2.5 concentrations derived from the filter sample and (2) correction factors for the low-cost sensor response to ammonium sulfate, Arizona road dust, urban particulate matter, and match smoke. Filter samples collected at 0.25 and 1.0 L min-1 had mean biases of -10% and -4%, relative to a tapered element oscillating microbalance, and a relative standard deviation (RSD) that ranged from 1% to 17%. The low-cost sensor correction factor varied with the test aerosol, sample flow rate, and between individual monitors. Gravimetric correctio...Continue Reading

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Citations

Sep 25, 2020·Annals of Work Exposures and Health·Nima Afshar-MohajerJohn Volckens
Nov 25, 2020·International Journal of Environmental Research and Public Health·Sander RuiterEmanuele Cauda
Jan 1, 2020·Atmospheric Measurement Techniques·David H Hagan, Jesse H Kroll
Sep 11, 2021·Atmospheric Measurement Techniques·Karoline K BarkjohnAndrea L Clements

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Methods Mentioned

BETA
light-scattering
X-ray

Software Mentioned

R

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