Air pollutant emissions in Switzerland have fallen sharply since 1980. The drop in PM2.5 fine particulate matter has been especially marked. In 2016, emissions in Switzerland were roughly 7,000 tonnes, which is around 30 percent less than in 2005. Under the Convention Long-Range Transboundary Air Pollution, Switzerland is obliged to draw up an annual inventory of air pollutant emissions. INFRAS was a key participant in the corresponding report, having been commissioned as its lead author by the Swiss Federal Office of the Environment.