One of the most important environmental issues in densely populated areas is the problem of noise. Traffic noise from cars, railway vehicles and airports located in close proximity to the city is not only annoying for residents; it also leads to serious health issues and has an enormous negative economic impact. In 2002, to improve the noise situation in Europe, the EU issued the Environmental Noise Directive (2002/49/EC). The aim of the Directive is to reduce environmental noise and to prevent an increase in noise in areas which are traditionally quiet. For this purpose, noise calculations are conducted for major roads, major railway lines, and various major airports with a high volume of traffic as well as large agglomerations. Until 2018, for this task a national interim method has been used. In 2019, it is replaced by a new calculation procedure, because the European Commission has developed „Common Noise Assessment Methods in Europe, CNOSSOS-EU”. These methods have been implemented in Annex II to Directive 2002/49/EC in 2015. The transposition of this calculation procedure into German law will be explained in detail.