The world's largest air purifier has been installed in a square outside the venue of this week’s World Economic Forum, or Summer Davos, in northeast China’s Dalian city. /CFP Photo

Invented by Dutch designer Daan Roosegaarde, the seven-meter-tall Smog Free Tower is designed to suck in 75 percent of pollutants and clean 30,000 cubic meters of air per hour. /CFP Photo

China has been plagued by smog in recent years. With the pollutants in the air harmful to human health, the Chinese government has been seeking solutions including addressing the problem at its root by limiting factories’ emissions. Air purifiers are highly prized in the meantime. /CFP Photo

Daan Roosegaarde was a youth delegate at Summer Davos, which closed on Wednesday. He is passionate about raising awareness in society to seek better solutions to combat air pollution. /CFP Photo