A tower has been built in Xian in Shaanxi province, northern China that is said to be the largest air purifier in the world standing at over 100 meters (328 feet) high.
It has been undergoing testing by researchers at the Institute of Earth Environment at the Chinese Academy of Sciences to quantify its effectiveness.

Authorities are seeking ways to tackle the nation’s chronic smog problem and this could be a good solution if they can prove it works well.

The scientist leading the project claim it has brought a noticeable improvement in air quality, although further testing is required.