Rush-hour traffic, road works, public transport, crowds of people – the noise of the city can reach dangerously high levels of up to 100 decibels. City residents, constantly exposed to sound levels over 80 decibels, run the risk of developing irreparable hearing loss. Hear the World has been in several metropolises like New York, London and Berlin to find out how loud the cities really are. The alarming results are shown on our Sound Map.