‘Smog Free Tower’, largest air purifier in Beijing, sparks controversy
A "Smog Free Tower" undergoing tests in Beijing's famed 798 art zone has sparked controversy amid continuous heavy smog in the last couple of days. The seven-meter-high metal structure, designed by Dutch artist Daan Roosegaarde and introduced to the Chinese capital as the world's largest air purifier in late September, opened for testing and adjustment recently. The tower boasts a capacity to purify 30,000 cubic meters of air per hour and an ability to capture at least 75 percent of PM 2.5...