Field evaluation of NanoEnvi microsensors for O3 monitoring

Previous studies have showed that microsensors can successfully measure ozone in ambient air for a limited period of time after on-site calibration by comparison to ultraviolet photometry. This method is generally more successful than the calibration in exposure chambers under controlled conditions because of the difference between laboratory and fields air matrixes. To expand this result, we carried out an experiment at two sampling sites. At the first site, the microsensors were calibrated during a few days. Subsequently, the calibrated microsensors were taken to another sampling site where the effectiveness of the calibration function of the first site was evaluated. The trend of the differences between UV photometry and microsensors were analyzed to evidence possible drift of the microsensors over time. The correlation of these differences with meteorological data was investigated to evidence possible interference and to propose new calibration methods.