New understanding of miniaturized VOCs monitoring device: PID-type sensors performance evaluations in ambient air

Abstract With low-cost sensors getting more attention in network monitoring, whether volatile organic compounds (VOCs) sensors are easily serviceable in ambient air monitoring is debatable. Evaluations of performance are necessary to provide a comprehensive understanding of commercially available sensor devices at present. In this paper, 17 photo-ionization detectors (PID) based VOC sensor devices have been evaluated through both laboratory and field tests, sensor were primarily from Alphasense and Baseline. The results exhibited the average level of all participating devices and the influence of the humidity on the results has been discussed in detail. Good linearity (R2>0.93), repeatability (