Noise maps in different cities and institutions can be viewed interactively.
Different cities and municipalities make the designated quiet areas available in spatial data infrastructures or open data portals, but often only in pdf-format.
Civil society should be involved in Citizen Science projects in mapping environmental noise.
Lukas Martinelli pursued another interesting approach with the openstreetmap-noise-pollution-map. Here, noise emissions defined at various OSM features are displayed with buffers around these features: GitHub-Project.