China Built World’s Tallest Air Purifier
The tower, which is being tested by researchers from the Institute of Earth Environment at the Chinese Academy of Sciences, has noticeably cleaner air over an area of 10 square kilometers since being turned on last year, according to the South China Morning Post.
The tower sucks in polluted air and funnels it into greenhouses at the base of the structure. The smog is heated in the greenhouse by solar energy, then rises through the tower, passing through several layers of cleaning filters. The expelled air contains 15 percent less particulate matter than it did before being scrubbed.
The greenhouses are powered by solar energy and are able to run in winter as well as summer. Cao Junji, head of research, said, “It barely requires any power input throughout daylight hours. The idea has worked very well in the test run.”
Cao and his team are now planning a 500-meter-tall and 200-meter-wide tower, with greenhouses covering 30 square kilometers that would be able to purify air for a small city.
Air purifiers have been installed in China before, but only in a symbolic way. Last year a 4-meter-high filter called “CityTree” was tried out in Berlin.