Engineering students have made roof tiles that break down air pollutants when exposed to sunlight.

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via ScienceAlert

Titanium dioxide breaks down smog particles in the air, and students in the US have shown that in one year, one roof coated in it can break down the smog from a car that’s driven 17,000 km(10,500 miles). And every day, 21 tonnes of smog could be eliminated by one million treated roofs.

http://txchnologist.com/post/88500055810/students-show-common-compound-breaks-down-air-pollution