World's largest air purifier takes on China's smog
by Sophie Morlin-Yron @CNNTech July 1, 2016: 6:57 AM ET When artist Daan Roosegaarde visited Beijing in 2014, he was inspired by what he didn’t see. From his hotel room on the 32nd floor, his view of the sprawling Chinese capital was totally obscured by smog. “It was all gone,” Roosegaarde says. “The city was