Das Projekt "Optimierung von Modellierungsverfahren zur Umweltbelastung durch Verkehr (TRAPOS)" wird vom Umweltbundesamt gefördert und von Universität Hamburg, Zentrum für Meeres- und Klimaforschung, Meteorologisches Institut durchgeführt. The overall objective of the project is to optimize and improve the modelling methods for traffic pollution in urban streets. Based on evaluation of presently available models and study of results from field and laboratory experiments, the major deficits in the description of important processes will be first identified and then addressed. This will be done in the context of the European Union programme 'Training and Mobility of Researchers'.