Air pollutant emissions in Switzerland have fallen sharply since 1980. Stricter emission limits in traffic and a limitation of the sulphur content in liquid fuels have led, for example, to a significant reduction in pollutants such as nitrogen oxides and sulphur oxides. Under the Geneva Convention on Long-Range Transboundary Air Pollution, Switzerland is obliged to draw up an annual inventory of air pollutant emissions. On behalf of the Federal Office for the Environment, INFRAS was involved as data supplier and co-author.