a set of giant posters located in Madrid, London, Berlin, Brussels & Milan that monitor the noise level on a high-traffic roads. ambient noise levels are displayed via decibel meters connected to LED screens embedded in billboards, in homage to Noise Awareness Day (April 16). the posters were part of AEG-Electrolux's advertising campaign supporting its new silent washing machine. the accompanying Web site also compares decibel levels of the major urban areas on line graphs to learn more about the detriments of noise pollution.
"Local school kids are taking it a step further and are deliberately shouting at the sign in unison in order to make the numbers change. The Manager of the night club is finding the poster helpful too – he is taking photos of the sign in the early hours of the morning to show the local council that he is not making too much noise."