In addition to the identification of the potential exposure pathways of the population, the quantitative impact assessment of a soil pollution requires the best available knowledge of the daily exposure parameters for the people living in or near the polluted area. Aiming to characterize in this way the French population, the French Agency for Environment and Energy Management (Ademe) and the Institute for Radioprotection and Nuclear Safety (IRSN) collaborated to produce the computer databank Ciblex. It describes the exposure parameters of the population (age, sex, activities, dietary habits…) as a function of the land use (artificial areas, semi-natural land, water surfaces…) and its corresponding vocation (residential, professional, leisure…). These data can be consulted individually for several geographical levels, or they can be extracted from the bank in correspondence with an exposure scenario, which is defined by the user for a reference group. The Ciblex bank constitutes a consultative tool developed in priority for experts involved in risk assessments associated with the management of area polluted by chemicals or radionuclides. But it is equally very interesting for most of the environmental problems that need to characterize a site or a population.