The CEREA "Centre d'Enseignement et Recherche en Environnement Atmospherique" is a center of excellence for the modeling of atmospheric composition and environment. It is a common Lab between EDF R&D and ENPC (Ecole des Ponts ParisTech) with two locations: ENPC Champs sur Marne and EDF R&D Chatou. Its research activities are focused on air pollution. These activities range from academic research (aerosol modeling, data assimilation and inverse modeling, atmospheric boundary layer) to impact assessment studies (assessment of environmental impact of transport and thermal or nuclear energy production), using modeling/prediction of reactive pollutant transport at regional level or even modeling at the local level (urban air pollution, indoor air quality). These activities are coupled with the programs of EDF R&D and strongly related to the other organizations of the French Ministry for Ecology (MTES), through its Research Directorate (DRI). Director: Pietro Bernardara