The risk of serious accidents concerns sites where the presence of hazardous substances in certain amounts represents a real risk of the occurrence of a large-scale incident in terms of damage to people, things and the environment.
After the serious accident of 1976 at the Icmesa plant in Seveso, there was an obvious need to regulate the safety of industrial plants whose production processes required high quantities of dangerous substances that could cause accidents beyond the confines of the production area.
To this end there have been a series of European provisions (called Seveso Directives, Seveso bis, Seveso ter etc.) that were taken on a national level by different member states. Their objective is to prevent serious accidents connected to the use of hazardous substances.