The meteorological observatory on the Hohenpeissenberg (1000 m a.s.l.) in southern Germany is the oldest mountain observatory worldwide. It has been collecting data sine 1781. Since 1993 the Deutscher Wetterdienst (DWD) is a member of the Global Atmosphere Watch (GAW) climate monitoring programme of the world meteorological organisation (WMO). Since 1995 the observatory has been involved in measuring trace gases, aerosols and chemical substances contained in rain.
Those data and its scientific interpretation is the base for a better understanding of chemical and meteorological processes in our atmosphere, especially with regards to the climate change.