Welcome speech - Peter Aakjaer, Director General, DMI Dear Colleagues! I am pleased to welcome you all here at DMI to this COST/NETFAM workshop on the integration of weather models and air pollution models, and I am happy to get the opportunity to address you here today. Weather hazards, the environment and climate change are of concern to all of us. Especially, how human activities impact nature is essential to understand. And its monitoring, forecasting and research are thus of the utmost importance. Furthermore, climate change and pollution of the environment do not respect national borders, so international collaboration on these issues is indeed extremely important. Here at DMI we have a long experience in environmental modelling and forecasting. Our activities include weather and climate modelling and modelling atmospheric dispersion, transformation and deposition of pollutants. Our weather forecasting model - DMI-HIRLAM - has been developed over many years - and is now run operationally for Denmark and Greenland in a 5 km horizontal resolution. The general quality of HIRLAM has been improved enormously over the years, and the improvements are expected to continue over the next years due to the fact that we will acquire a new High Speed Computer. We are at the moment in the ITT process hoping for at least a factor of 10-12 to the speed of our present system. DMI has a long tradition of working on many aspects concerning air pollution, both nationally and internationally - not only research, but we are - like many meteorological institutes also the national focal point for several emergency preparedness dealing with nuclear, bio- and veterinary emergency, pollen forecasting, risk assessments, and airborne dispersion of foot-and-mouth disease virus to mention a few. And I cannot resist mentioning that we are proud that our model DERMA was one of the most successful among 28 models in the European Tracer EXperiment - ETEX - some years ago. An automatic computerised system has been developed providing real-time high-resolution forecast data derived from the DMI-HIRLAM system to ARGOS and RODOS for urban- and regional-scale atmospheric dispersion modelling. DMI led a big European project FUMAPEX, which developed a new generation Integrated Urban Air Quality Information and Forecasting System and implemented it in 6 European cities. In the future, the increasing resolution of meteorological, climate and oceanographic models are paving the way for integrated modelling of the Earth system and the possibility to include meteorology, environment, climate, ocean, cryosphere and ecosystem interactions. DMI strongly supports this development and is currently focussing on such a project. As part of this strategy we are currently developing a chemical weather forecast model, ENVIRO-HIRLAM, which will include interactions between meteorology and air pollution. I hope - and I am sure - that the discussion during this workshop will lead to synergy between the meteorological and air pollution communities and that this can be used to develop more precise models for the benefit of all of us. I wish you all a fruitful meeting and a pleasant stay in Copenhagen. The weather during your stay seems to bee on your side. Thank you for your attention.