The Smog Free Ring made of compressed smog particles collected by the world's largest smog vacuum cleaner designed by Dutch artist and innovator Daan Roosegaarde as part of his The Smog Free Project is presented at D-751 art zone in Beijing September 29, 2016. The Smog Free Project consist of 7-meter tall the Smog Free Tower, the large air purifier that creates an area of clean air around it and the Smog Free Jewellery that are made of compressed smog particles. (Photo by Damir Sagolj/Reuters)
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