Evaluation of low-cost electro-chemical sensors for environmental monitoring of ozone, nitrogen dioxide, and carbon monoxide

Journal of Occupational and Environmental Hygiene
Nima Afshar-MohajerKirsten Koehler

Abstract

Development of an air quality monitoring network with high spatio-temporal resolution requires installation of a large number of air pollutant monitors. However, state-of-the-art monitors are costly and may not be compatible with wireless data logging systems. In this study, low-cost electro-chemical sensors manufactured by Alphasense Ltd. for detection of CO and oxidative gases (predominantly O3 and NO2) were evaluated. The voltages from three oxidative gas sensors and three CO sensors were recorded every 2.5 sec when exposed to controlled gas concentrations in a 0.125-m3 acrylic glass chamber. Electro-chemical sensors for detection of oxidative gases demonstrated sensitivity to both NO2 and O3 with similar voltages recorded when exposed to equivalent environmental concentrations of NO2 or O3 gases, when evaluated separately. There was a strong linear relationship between the recorded voltages and target concentrations of oxidative gases (R2 > 0.98) over a wide range of concentrations. Although a strong linear relationship was also observed for CO concentrations below 12 ppm, a saturation effect was observed wherein the voltage only changes minimally for higher CO concentrations (12-50 ppm). The nonlinear behavior of the CO se...Continue Reading

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Citations

Nov 10, 2018·Journal of Occupational and Environmental Hygiene·Christopher ZuidemaKirsten Koehler
Feb 5, 2019·Annals of Work Exposures and Health·Christopher ZuidemaKirsten Koehler
May 13, 2018·Sensors·Geb W ThomasThomas M Peters
Jun 6, 2019·Journal of Exposure Science & Environmental Epidemiology·Christopher ZuidemaKirsten Koehler
Jan 17, 2021·Environmental Monitoring and Assessment·Jagriti SainiGoncalo Marques
Oct 13, 2018·The Science of the Total Environment·Esther RivasJesús Miguel Santamaría
Nov 22, 2021·The Science of the Total Environment·Ye KangJin Zhou

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Methods Mentioned

BETA
Alphasense
irradiates

Software Mentioned

Arduino
Visual Basic for Application ( VBA )

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