Author(s)

J.G. Kretzschmar & G. Cosemans

Abstract

Taking into account the important role of air pollution modelling in regulating new and existing installations, and being well aware of the uncertainties inherent to modelling, model developers and users started a voluntary European Initiative on Harmonisation of Regulatory Air Pollution Models in 1991. After five years of intensive collaboration and exchange of information, facts and figures proved that harmonisation of air pollution models - based on well defined procedures and protocols - is indeed urgently needed at a level controlled by some official European agency, similar to what has be done since many years in the field of ambient air pollution monitoring. 1 Introduction Atmospheric transport and dispersion models have

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