Issue 5, 2023

Evaluation of low-cost gas sensors to quantify intra-urban variability of atmospheric pollutants

Abstract

Low-cost air quality monitoring units were tested within the context of the European research project TRAFAIR. This study aims to quantify the intra-urban variability of atmospheric pollutants by means of a low-cost sensor network, which was deployed across the urban area of Modena, in the Po Valley (Italy) for the assessment of air quality in the city. Each sensor unit featured a set of electrochemical cells responding to NO, NO2 and O3 delivering a current/voltage proportional to the mixing ratio of the target atmospheric pollutant. Each unit was calibrated using field colocation next to an urban regulatory air quality monitoring station in the city. A machine learning Random Forest algorithm was used as a calibration model and different configurations of the model were applied. The results from these configurations were compared in terms of their prediction performance and consistency of the explanatory variable role within the model. A significant variability in all pollutants across town was revealed by the units, highlighting areas impacted by local sources.

Graphical abstract: Evaluation of low-cost gas sensors to quantify intra-urban variability of atmospheric pollutants

Supplementary files

Article information

Article type
Paper
Submitted
29 nov 2022
Accepted
06 mar 2023
First published
06 mar 2023
This article is Open Access
Creative Commons BY-NC license

Environ. Sci.: Atmos., 2023,3, 830-841

Evaluation of low-cost gas sensors to quantify intra-urban variability of atmospheric pollutants

A. Baruah, O. Zivan, A. Bigi and G. Ghermandi, Environ. Sci.: Atmos., 2023, 3, 830 DOI: 10.1039/D2EA00165A

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