ROAD MATERIALS THAT clean the air. ” A research team at the Eindhoven University of Technology (TU/e) in the Netherlands have invented a type of paving material that can be mixed in with normal asphalt or concrete that actually removes some pollutants from the air as cars travel over the surface. The effect works well enough to remove some 25% to 45% of nitrogen oxides from vehicle emissions. The best part: the material reportedly doesn’t even cost that much more than a normal roadway to construct.”