Daan Roosegaarde is the mastermind behind the world's first smog vacuum cleaner. The Smog Free Tower measures almost 23 feet high (7 meters) and sucks in polluted air, cleaning it through a process of ionization before releasing it again. At its peak performance, the tower cleans 30,000 m3 of air per hour.

Thanks to Roosegaarde's design, you can even wear rings made from the compressed smog particles collected from the tower. By buying and wearing a Smog Free Ring, you're contributing to over 10,700 square feet (1000 square meters) of clean air. The project has garnered a lot of attention since its inception, winning multiple awards. Recent tower campaigns have been launched in South Korea, China, the Netherlands, Mexico, and Poland.