The Seveso Directive was introduced following a disaster in the Italian town of Seveso in 1976. It aims to prevent major accidents involving dangerous substances and to limit consequences of such accidents for people and the environment. It was subsequently broadened as Seveso II.
In Northern Ireland the directive is implemented through the Control of Major Accident Hazards Regulations (COMAH), by a joint Competent Authority(CA), made up of the Health and Safety Executive for Northern Ireland and the Northern Ireland Environment Agency.
COMAH applies when a site has more than a threshold quantity of dangerous substances present (Lower Tier). Sites are subject to more stringent controls if the quantities of substances present are above a higher threshold (Top Tier).
Please note that these links are to the original legislation, visitors should verify for themselves whether legislation is in force or whether it has been amended or repealed by subsequent legislation.