(Business Insider) - The air we breathe is not as clean as it once was. And in many cases, it is getting worse. On high-smog days in Kraków, Poland, the city's air pollution can reach six times that of safe levels. And in the United States, about 4 in 10 people live in counties that have unhealthy levels of either ozone or particle pollution, according to the American Lung Association. To help clean up the air, Dutch designer Daan Roosegaarde created a 23-foot-tall air purifier called the Smog-Free Tower in 2015. Now, he's installing a tower at Jordana Park in Kraków, where it will stay from February 16 to April 15. The air purifier doesn’t just clean up smog, it can also be used to make fine jewelry.
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