Stéphane is Professor at the Center for Energy and Environment at IMT Nord Europe. He is an expert in air quality issues especially on reactive trace gases from their in-situ monitoring to their source apportionment as well as the understanding of their fate at different scales. He is the head of the French node of ACTRIS, which is a distributed research infrastructure focusing on shortlife atmospheric species impacting air quality and climate. He has been involved in several research programs (MEGAPOLI, ECOCEM, TRANSEMED, CHARMEX, LANDEX) and is (co-)author of 55+ peer-reviewed articles.