MATTE is an acronym for Major Accident to the Environment. The term is used in EU major accident prevention legislation, socalled Seveso II. Further guidance and the definition of MATTE is available in "Guidance on the Interpretation of Major Accident to the Environment for the Purposes of the COMAH Regulations" Department of the Environment, Transport and the Regions -ISBN 0-11-753501-X June 1999".
References
MATTE Wikipedia(Text) CC BY-SA