Designer’s Air Purifier Converts Smog Into Jewelry As it Cleans
Daan Roosegaarde first got the idea for the device while visiting smog-filled Beijing. Inspiration struck when he realized that air pollution is largely CO2, which is made up of tiny little particles of carbon–and if you put a lot of carbon under enough pressure, it turns into diamonds.
http://www.goodnewsnetwork.org/designers-air-purifier-converts-smog-into-jewelry/