The Smog Free Tower is a seven-metre-tall smog vacuum cleaner. Using ionisation technology, it filters 30,000m³ of air each hour, removing particulates and crushing the particulate carbon to make thought-provoking gemstones.

As part of their Smog Free Project, Studio Roosegaarde has developed a seven-metre-tall aluminium tower that they liken to a giant pollution vacuum. However, unlike a conventional vacuum cleaner, the towers rely on positive ionisation technology, whereby statically charged particles attract polluting particulates and remove them from the air.

The Smog Free Tower consumes around the same amount of electricity as a kettle, but where possible, the designers have attempted to run them from renewable energy sources. The Tower can filter 30,000m³ of air every hour, and removes between 50-70% of small particulate matter. To date, it has been installed in cities in the Netherlands, Poland, India and China. The company also produce jewellery featuring black, diamond-like rocks from the collected particulate matter.

It is estimated that air pollution is responsible for around seven million premature deaths every year. The Smog Free Tower can directly improve air quality in public spaces using their patented ionisation technique.