CNOSSOS-EU (Common Noise Assessment Methods in Europe) is the mandatory standard for strategic environmental noise mapping across EU Member States, established under the Environmental Noise Directive (END).

European Union, an REIO comprised of Belgium, France, Germany, Italy, Luxembourg, Netherlands, Denmark, Ireland, Greece, Portugal, Spain, Austria, Finland, Sweden, Cyprus, Czechia, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia, Slovenia, Bulgaria, and Romania.