What an interesting innovation:
This “paint” works by breaking down air “contaminants via a photocatalytic process that transforms polluting particles into oxidizing agents. They’re then released into the atmosphere as harmless minerals.” The building in Manhattan pictured here has its facade covered by it. “This process happens super fast—like millions-of-times-per-second fast—so that the surface is perpetually self-cleaning, minimizing operational costs for the building.”
See the original article and more info here.