Photocatalytic Concrete: Air-Cleaning Building Absorbs Smog

  Featuring 100,000 square feet of smog-filtering surface area, this structural facade will break down harmful oxides in sunlight to improve air quality all around it.

  The building, designed by Italian firm, is being created for an exposition in Milan themed around planet-friendly sustainable designs.

  The amorphous and organic form is both a reference to trees and other types of air-purifying plants but also a way to provide a maximum amount of exposed surface.

  Like a forest, this facade will cast complex shadows and provide shade in and around the building. Its form references both nature and man-made land art.

  Rooftop solar panels tucked out of view will add a further but less-visible green dimension, generating electricity for the building below.