American students claim to clean the air with roof tiles

6 Jun 2014

California science students say they have created a roof tile coating that when applied to an average-sized residential roof breaks down the same amount of smog-causing nitrogen oxides per year as a car driven 11,000 miles.


They calculated 21 tonnes of nitrogen oxides would be eliminated daily if tiles on one million roofs were coated with their titanium dioxide mixture.


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