We have a sound sensor measuring noise levels originally built and programmed at Make Zurich 2017. The idea would be to build on this, deploying sensors at various locations and making realtime and historic views of the neighbourhood's noise levels. During the first (4 hour) workshop at MuDA, the resulting histogram (including the silence after we left) looks like this:

You can also view this full screen or download (JSON) data from all five days of the event for your own analysis.