Moss-covered CityTree has the same air-purifying effect as 275 regular trees

20 of them have been deployed so far around the world From smog-sucking bikes to electric taxis and paint made of car exhaust, designers and architects are stepping up to address air pollution?the world?s single largest health risk. But a new air filter making the rounds in Oslo, Paris, Brussels, and Hong Kong shows that nature may be our be...

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