First building with smog eating cement

A building at the Milan Expo will feature a first of its kind, smog eating photocatalytic cement! When in contact with ultraviolet light, the titanium oxide in the mix reacts with nitrogen oxide in the air turning the pollutant into a salt that can be washed away! Talk about cool sustainable innovations! http://www.engadget.com/2014/05/24/milan-air-cleaning-building/