A towering feat: China builds ‘world’s biggest air purifier’

A full-sized smog tower would reach 500 metres (1,640 feet) high with a diameter of 200 metres (656 feet), according to a patent application the makers filed in 2014.
Read more: http://indianexpress.com/article/world/at-330-feet-tall-china-builds-worlds-biggest-air-purifier-5027274/?source=Snapzu