Core77

Air-purifying concrete paving stones are to be tested on a road in the small Dutch town of Hengelo. Researchers at the University of Twente in The Netherlands have developed a new concrete with a titanium dioxide-based additive, it binds nitrogen oxide particles emitted by car exhausts when exposed to sunlight converting them to harmless nitrates. The best bit, a single shower of rain washes everything away making it ready to filter again and again. If only Beijing had got wind of this earlier, they might have been a step closer to deserving the title "Green Olympics".

via gizmodo