Air Pollution and Vegetation describes the recent work of the International Cooperative Programme on effects of air pollution on natural vegetation and crops (ICP Vegetation), a research programme conducted in 35 countries in the UNECE region. Reporting to the Working Group on Effects of the Convention on Long-range Transboundary Air Pollution, the ICP Vegetation is providing information for the revision of international protocols to reduce air pollution problems caused by, for example, ground-level ozone, heavy metals and nitrogen.