The research project “National Implementation of the UNECE Convention on Long-range Trans-boundary Air Pollution (Effects): ICP Modelling&Mapping NFC; Heavy Metals (Critical Loads, Deposition); Nitrogen + Acidity (Deposition); Nitrogen (Effects); Material Corrosion; Critical Ozone fluxes” (BMU/UBA FE-No. 204 63 252) is carried out on behalf of Federal Environment Agency, Dessau (Umweltbundesamt, UBA). The aim of the project is to support the German Federal Environmental Agency in calculation and verification of national data to be implemented in European scale Critical Loads and Levels maps. Special interest is put on the detection of long term trends in deposition loads and concentration of air pollutants in Germany, and on risk assessment describing the (potential) effects caused by anthropogenic emission.