Titanium dioxide breaks down smog particles in the air, and students in the US have shown that in one year, one roof coated in it can break down the smog from a car that’s driven 17,000 km(10,500 miles). And every day, 21 tonnes of smog could be eliminated by one million treated roofs.
Kawai Tam, Chun-Yu “Jimmy” Liang, Jessica Moncayo, Edwin Rodriguez, Carlos Espinoza, Kelly McCoy, David Cocker and Louis Lancaster. From UC Riverside. Not just “Engineering students”.