Manual on methodologies and criteria for mapping critical levels/loads and geographical areas where they are exceeded

An assessment of the risk the environment faces from air pollution is best achieved by comparing the tolerance or sensitivity of ecosystems with the burden they receive by ambient air pollutant concentrations or the deposition load. The best picture of the extent of the problems and the urgency of counter measures can be given by mapping those areas where threshold ''critical'' values are exceeded. The new and revised version of the Mapping Manual, discussed and adopted at the eighth meeting of the Task Force on Mapping in Berlin (Germany) in April 1993, represents the basic guideline for mapping critical levels and loads within the framework of the UN ECE Convention on Long-Range Transboundary Air Pollution. (orig.)Prepared by the Task Force on Mapping with the assistance of the Coordination Center for Effects and the Secretariat of the United Nations Economic Commission for Europe (UN ECE)Available from TIB Hannover: RN 8422(1993,25) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman