This leaflet provides a list of chemical products, following the UN classification, presenting a potential risk for people's health and the environment (explosives, gaz, inflammable fluids, ?) and the identification system of risks used by the European Commission for their transportation, and their classification by degree of danger. It reviews the various risks and recommends actions in case of accident. It also presents the Technical Advisory Committee for Technological Emergencies (CATET). (UNEsCO)