Balloon Indicates Air Pollution

A giant helium balloon indicates how polluted the air above Paris is by the use of a colourful lighting system. The colours, created by 3 projectors in the middle of the balloon, are red (highly polluted), orange (polluted), yellow (moderate), light green (clean) and green (very clean). The video is in French but the concept is worth having a look at, I think.

via infosthetics

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