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Effects of Road Traffic on the Accuracy and Bias of Low-Cost Particulate Matter Sensor Measurements in Houston, Texas
Oluwadairo, Temitope Whitehead, Lawrence Symanski, Elaine Bauer, Cici Carson, Arch
Oluwadairo, Temitope
Whitehead, Lawrence
Symanski, Elaine
Bauer, Cici
Carson, Arch
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Journal article
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2022-01-19
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Epidemiology and Biostatistics
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http://dx.doi.org/10.3390/ijerph19031086
Abstract
Although PM2.5 measurements of low-cost particulate matter sensors (LCPMS) generally show moderate and strong correlations with those from research-grade air monitors, the data quality of LCPMS has not been fully assessed in urban environments with different road traffic conditions. We examined the linear relationships between PM2.5 measurements taken by an LCPMS (Dylos DC1700) and two research grade monitors, a personal environmental monitor (PEM) and the GRIMM 11R, in three different urban environments, and compared the accuracy (slope) and bias of these environments. PM2.5 measurements were carried out at three locations in Houston, Texas (Clinton Drive largely with diesel trucks, US-59 mostly with gasoline vehicles, and a residential home with no major sources of traffic emissions nearby). The slopes of the regressions of the PEM on Dylos and Grimm measurements varied by location (e.g., PEM/Dylos slope at Clinton Drive = 0.98 (R2 = 0.77), at US-59 = 0.63 (R2 = 0.42), and at the residence = 0.29 (R2 = 0.31)). Although the regression slopes and coefficients differed across the three urban environments, the mean percent bias was not significantly different. Using the correct slope for LCPMS measurements is key for accurately estimating ambient PM2.5 mass in urban environments.
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Citation
Oluwadairo, T.; Whitehead, L.; Symanski, E.; Bauer, C.; Carson, A.; Han, I. Effects of Road Traffic on the Accuracy and Bias of Low-Cost Particulate Matter Sensor Measurements in Houston, Texas. Int. J. Environ. Res. Public Health 2022, 19, 1086. https://doi.org/10.3390/ijerph19031086
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International Journal of Environmental Research and Public Health, Vol. 19, Iss. 3
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