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Smog-Fighting Shingles Helping to Clean California Air


Smog-Fighting Shingles Helping to Clean California Air
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Northern California is famous for many things, the sun, the surf, the wine, but it has also been infamous for its smog. Smog is a noxious collection of nitrogen and sulfur oxides, along with smoke and dirty particles, which all combine to form a foglike haze in the air. But some new technology is promising to turn a roof into an air cleaner. VOA's Kevin Enochs reports.

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