A Concrete Step Toward Cleaner Air

Visitors to the Venice Biennale can check out the smog-eating cement that Italian inventors claim will help cities clean themselves

Venice hardly counts among the most-polluted places in the world. There are no cars traveling its narrow streets, and all traffic is either by foot or by boat. So despite the crowded walkways and canals, the air in Venice is far cleaner than that of, say, Milan, Italy's economic capital, which recent figures indicate has some of the worst air quality in Europe.

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