Laboratory Chamber Evaluation of Flow Air Quality Sensor PM 2.5 and PM 10 Measurements.

The emergence of low-cost air quality sensors as viable tools for the monitoring of air quality at population and individual levels necessitates the evaluation of these instruments. The Flow air quality tracker, a product of Plume Labs, is one such sensor. To evaluate these sensors, we assessed 34 of them in a controlled laboratory setting by exposing them to PM 10 and PM 2.5 and compared the response with Plantower A003 measurements. The overall coefficient of determination (R 2 ) of measured PM 2.5 was 0.76 and of PM 10 it was 0.73, but the Flows' accuracy improved after each introduction of incense. Overall, these findings suggest that the Flow can be a useful air quality monitoring tool in air pollution areas with higher concentrations, when incorporated into other monitoring frameworks and when used in aggregate. The broader environmental implications of this work are that it is possible for individuals and groups to monitor their individual exposure to particulate matter pollution.