Can the roof of your house help you breathe easier by reducing the amount of harmful pollutants from urban air?
"Yes," claims John Renowden, vice president of technology at Boral Roofing, a U.S. company that has introduced a line of roof tiles that they say have pollution-busting properties.
Based near Los Angeles, the most ozone-polluted city in the U.S., according to 2012 rankings by the American Lung Association, the company says its "Smog-Eating Tiles" improve air quality by neutralizing smog-forming nitrogen oxides released by most vehicles (read more about smog in our fact box).
The tiles are coated with titanium dioxide, a photocalyst that can oxidize harmful air pollutants emitted in the burning of fossil fuels. When exposed to natural light, the titanium dioxide breaks down nitrogen oxides in the air and turns them into harmless calcium nitrate.
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