An experimental air purification tower standing more than 100 metres high in northern China showed encouraging results in improving air quality during testing in 2018, according to researchers leading the project. The facility, described by its operators as the world's largest air purifier, reportedly improved air conditions across a 10-square-kilometre area of Xian as authorities explored solutions to the country's long-standing smog problem.
The tower was built in Xian, Shaanxi province, and was undergoing testing by researchers from the Chinese Academy of Sciences' Institute of Earth Environment.
