The potential solution to smog and pollution may be hovering right over our heads, now that Students at the University of California - Riverside have designed a pollution reducing rooftop tile. According to their calculations, cladding one million rooftops with the tiles could remove 21 tons of nitrogen oxides -- daily. Currently the Los Angeles area spits out 500 tons of nitrogen oxides a day, so the tiles are just one piece of the puzzle in reducing pollution - however the students are imagining their nitrogen-oxide-eating Titanium Dioxide compound in exterior paints, concrete and more. To see all the possibilities, read the full article here.