ISSeP took part in the EFCA Symposium (European Federation of Clean Air and Environmental Protection Associations) An oral presentation was given by Luc Bertrand (DES/CQA), entitled : “Monitoring Black Carbon concentrations with mobile devices in the city of Liège”. Co-authors: Fabian Lenartz, François Detalle and Nicolas Fernemont (DSED/CQA), and Yves Cornet and Christophe Louis (Geomatics Unit, University of Liège). This presentation is part of the ongoing ExTraCar (Exposure to Traffic and Black Carbon) project.