In the future, it’s likely we’ll go far beyong photocatalytic coatings when it comes to air-cleaning building design. This year’s eVolo Skyscraper Design Competition featured several pollution fighting concepts, including the Hyper Filter. “Located in the big cities between skyscrapers surrounded by busy traffic roads, stations and factories, the structure soaks up CO2 and other harmful gases and releases clear concentrated oxygen into the atmosphere,” reported Inhabitat.