In 1991, scientists and regulators in Europe started the Initiative for Harmonisation within Atmospheric Dispersion Modelling in Europe. One of the visible actions of this Initiative was the launch ...of a series of workshops, each one focusing on a particular step towards the achievement of better tools and data for model evaluation and towards an increasing awareness that models must be used in an appropriate way for decision making. In the 4th Workshop, an overview was given of relevant research co-ordinated at the European level, and a first bridge was established to the relevant European Agencies.
