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Modelling and Mapping

International Cooperative Programme on Modelling and Mapping of Critical Levels and Loads and Air Pollution Effects, Risks and Trends

Chair: Ms. Anne-Christine Le Gall
Head of Coordination Centre for Effects: Mr. Jean-Paul Hettelingh

Interest in the critical loads and levels approach for pollution control has gathered momentum over the past decades. To provide strategies for emission reductions as inputs to the negotiations of protocols to the Convention, the International Cooperative Programme on Modelling and Mapping of Critical Levels and Loads and Air Pollution Effects, Risks and Trends (ICP Modelling and Mapping) was established in 1988.

The objectives of the ICP Modelling and Mapping are to: determine receptor specific critical loads for indirect effects of the (long-term) deposition of various air pollutants and critical levels for direct effects of gaseous air pollutants; to map pollutant depositions and concentrations which exceed critical thresholds; and to establish appropriate methods as a basis for assessing potential damage, e.g. via dynamic modelling.

At present, around 30 Parties participate in the programme activities and contribute national data to be integrated into European critical load maps. For those countries that are unable to provide national data, various European databases on soil, land, climatic and other variables are used to calculate critical loads. The maps are used for integrated assessment modelling by the Task Force on Integrated Assessment Modelling (TFIAM). A Mapping Manual produced in collaboration with other ICPs describes methods for calculating critical loads and levels, as well as for dynamic modelling to be used by National Focal Centres.

The programme is planned and coordinated by a Task Force under the leadership of France, located at L’Institut National de l’Environnement Industriel et des Risques (INERIS), in collaboration with the Coordination Centre for Effects (CCE) at the National Institute for Public Health and the Environment, Netherlands (RIVM).

Further information is available from the Task Force and from the Coordination Centre for Effects.