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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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doi:10.5194/amt-2017-22
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
15 Mar 2017
Review status
This discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Design of an ozone and nitrogen dioxide sensor unit and its long-term operation within a sensor network in the city of Zurich
Michael Mueller1, Jonas Meyer2, and Christoph Hueglin1 1Empa, Swiss Federal Institute for Materials Science and Technology, Duebendorf, Switzerland
2Decentlab GmbH, Duebendorf, Switzerland
Abstract. This study focuses on the investigation and quantification of low-cost sensor performance in application fields such as the extension of traditional air quality monitoring networks or the replacement of diffusion tubes. For this, sensor units consisting of two boxes featuring NO2 and O3 low-cost sensors and wireless data transfer were engineered. The sensor units were initially operated at air quality monitoring sites for three months for performance analysis and initial calibration. Afterwards, they were relocated and operated within a sensor network consisting of six locations for more than one year. Our analyses show that the employed O3 and NO2 sensors can be accurate to 2–5 and 5–7 ppb, respectively, during the first three months of operation. This accuracy, however, could not be maintained during their operation within the sensor network related to changes in sensor behaviour. Hence, the low-cost sensors in our configuration do not reach the accuracy level of NO2 diffusion tubes. Tests in the laboratory revealed that changes in relative humidity can impact the signal of the employed NO2 sensors similarly as changes in ambient NO2 concentration. All the employed low-cost sensors need to be individually calibrated. Best performance of NO2 sensors is achieved when the calibration models include also time dependent parameters accounting for changes in sensor response over time. Accordingly, an effective procedure for continuous data control and correction is essential for obtaining meaningful data. It is demonstrated that linking the measurements from low-cost sensors to the high quality measurements from routine air quality monitoring stations is an effective procedure for both tasks provided that time periods can be identified when pollutant concentrations can be accurately predicted at sensor locations.

Citation: Mueller, M., Meyer, J., and Hueglin, C.: Design of an ozone and nitrogen dioxide sensor unit and its long-term operation within a sensor network in the city of Zurich, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2017-22, in review, 2017.
Michael Mueller et al.
Michael Mueller et al.
Michael Mueller et al.

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Short summary
This study describes the design of a sensor unit featuring NO2 and O3 sensors for applications such as ambient air quality monitoring. The manuscript presents the sensor calibration, the testing procedure and the long-term deployment of the sensor units in the city of Zurich. Main conclusions are the necessity of a proper mathematical description of the sensors as well as a concept to monitor sensor performance during operation, e.g. by linking low-cost sensors to traditional infrastructure.
This study describes the design of a sensor unit featuring NO2 and O3 sensors for applications...
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