Abstract. The aim of this study is to determine the spatiotemporal structure of the dispersion climate over Central Switzerland. For that reason the investigations have been divided into two parts. The first part deals with the analysis ofthe temperature stratification which is an important indicator of the vertical diffusion. It was carried out by using IR satellite data as well as temperature measurements and fog observations. The second part is concemed with a detailed analysis of the wind field. Measurements on more than 50 stations have been temporally interpolated and compared with numerical simulations.