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Sensors on trams to measure and geolocate air pollution

GreenZenTag: This first large-scale test of its kind in France brings together Egis, Transdev, SEMITAG and start-ups over a period of 18 months. The results of the experiment will help public authorities and residents to make better decisions regarding travel strategies and behaviours to be adopted during pollution peaks.


© SEMITAG – P_Paillard

Egis’s role in GreenZenTag is to analyse the data collected. Teams verify and validate this data, establish averages for each zone and prepare mapping and associated dashboards. Egis has also introduced a comparison between data from mobile sensors and its own, using a combination of fixed sensors and modelling.

Egis retrieves the raw data and turns it into a GIS database* for measuring air pollution concentration by zone. The data is then compared with that gathered by fixed sensors and information from Atmo Auvergne-Rhône-Alpes models. Egis establishes a map of the data and produces dashboards. The company shares its analyses with Atmo Auvergne-Rhône-Alpes (Authorised Observatory for monitoring and information on air quality in Auvergne-Rhône-Alpes). The observatory will assess whether such an approach is likely to bring added value to its work or whether it may be beneficial for regions that are yet to have a measurement and information system in place.
* GIS database: information system designed to collect, store, process, analyse, manage and present all types of spatial and geographic data.

Read the press kit (french version) to find out more (December 2016)