Engineers and designers in the Netherlands have created the world’s largest air purifier in the form of a free-standing tower that extracts smog from the surrounding atmosphere.

The Smog Free Tower stands just over seven metres in height and is capable of purifying as much as 28,300 cubic metres of air within the space of just an hour. The tower cleanses polluted air of smog particles by means of an ionization process that members of its development team have…