Eindhoven University of Technology scientists invented a green technology that combines strength, is practical and leads to air purification. The air purifying concrete is designed to eat smog and pollution by turning the harmful nitrogen oxide into nitrogenous compounds that are harmless. Under ideal weather conditions, the cement reduces nitrogen oxide pollution by up to 45 percent. This would amount to 19 percent of the total pollution. The only shortcoming of the eco-concrete is its price. Compared to normal concrete, it is quite more expensive because it uses titanium dioxide. Researchers are currently working on a way to make it more affordable.