Noxite® roofing membranes are quite different from all the other products in Icopals range. The surface slates/granules of the Noxite® membranes are coated with titanium dioxide which functions as a catalyst in the process of changing the NOx particles into harmless levels of nitrates. The process is activated when ultraviolet radiation from the sun hits the titanium dioxide particles, releasing energy for breaking down the NOx particles. Polluted air passes over the Noxite® membrane where the NOx particles are converted into harmless levels of water, carbon dioxide and nitrates, which are then washed away by the rain. It is that simple to clean the air, and the best part is that the Noxite® effect lasts for the entire life of the roof.