Manual on Methodologies and Criteria for Modelling and Mapping Critical Loads and Levels and Air Pollution Effects, Risks, and Trends

This Manual presents methods that are recommended for use by the Parties to the Convention on Long-range Transboundary Air Pollution (CLRTAP), represented by their National Focal Centres. The Modelling and Mapping Manual can help and assist NFCs to:
1. Model and map critical levels and loads in the ECE region;
2. Model and map areas with air pollution values exceeding critical levels or loads;
3. Develop, harmonize and apply methods and procedures (including dynamic modelling) to assess recovery and risk of future damage on specific targets including biodiversity in a context of climate change;
4. Determine and identify sensitive receptors and locations.
Thus, it provides a scientific basis on the application of critical levels and loads, their interrelationships, and the consequences for abatement strategies, e.g., for the assessment of optimized allocation of emission reductions.
This Manual includes methodologies used by ICP Materials to assess the impact of pollution on corrosion and soiling of building materials (Ch. 4) and by ICP Vegetation concerning the impact of air pollutants, and especially ozone, on crops and semi-natural vegetation (Ch. 3). In contrast to Manuals (or comparable methodological documents) of other ICPs and EMEP CCC, this manual does not contain information on methods of measurements nor on detailed data generation. This reflects the aims and tasks of the ICP Modelling and Mapping within the LRTAP Convention.