Air pollutant emissions have significantly been reduced in Switzerland since 1980. Particularly noticeable has been the reduction of nitrogen oxides: In 2015 there was an emission of about 59,000 tons. This means a 35 percent reduction within ten years. Under the Geneva Convention on Long-rang Transboundary Air Pollution (CLRTAP), Switzerland is required to annually issue its air pollution emission inventory ('CLRTAP Inventory'). On behalf of the Federal Office for the Environment (FOEN), INFRAS has been involved decisively as lead author of the corresponding explanatory report: Switzerland's Informative Inventory Report (IIR).