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BoralPure Smog-Eating Tiles remove nitrogen oxide from the atmosphere , improving the quality of the immediate environment . They contain the photocatalyst titanium dioxide , oxidising the vehicle-emitted poison . The harmless precipitate left behind in the chemical reaction washes away in the rain , and the UV light created naturally by this technology helps break down organic substances that occur on roofs . If the tiles ever require removal , they can be recycled for new structures or railways .

24 May 2016