![]() ![]() “Real progress in solving outdoor air pollution problems will require reductions in emissions from the major air pollution sources,” Harley told MACH in an email, “such as heavy industry, coal-burning power plants, motor vehicles, and residential cooking and heating, especially if people are still using solid fuels such as wood or coal for those purposes. Robert Harley, a professor of civil and environmental engineering at the University of California, Berkeley, who was also not involved with the Xi’an tower project. The Kurin City cleaner would be the strongest air. There may also be more practical ways of mitigating air pollution, rather than building giant filtration towers, according to Dr. It is claimed the tower will filter air for up to 75,000 people within a 3-kilometre (1.9 mi) radius. ![]() If the structure requires electricity from the grid that is fueled by coal, then operating the purifying system will itself generate harmful emissions. Xu, who wasn’t involved in the tower project, added that it’s important to take into account the energy costs involved with building and operating the towers. In addition to a proposed second tower in Xi’an, which would stand 984 feet tall, there are ongoing discussions about building massive air purifiers in the Chinese cities of Guanzhong, Hebei, and Henan, Cao told NBC News MACH in an email. Cao Junji, a chemist at the Chinese Academy of Sciences and the project’s leader, showed a 19-percent drop in PM2.5 over 3.86 square miles in the tower’s vicinity. It’s especially dangerous because these fine particles can be breathed deep into the lungs. One type of pollutant the prototype tower is designed to catch is known as PM2.5 because it’s made up of particulate matter no bigger than 2.5 microns in diameter. Sunlight heats the air within the greenhouse, Pui said, causing it to rise through the tower, where a series of air filters trap soot and other noxious particles. Liu qiang / Imaginechina via APīuilt in 2016, the $2 million Xi’an tower, dubbed the solar-assisted large-scale cleaning system, stands atop an enormous glass-roofed greenhouse. “If we can just reduce the air pollution in major metropolitan areas by 20 percent, for example, we can save tens of thousands of lives each year.” The prototype tower in Xi'an cost $2 million to build. David Pui, a professor of mechanical engineering at the University of Minnesota and one of the researchers. “I like to tell my students that we don’t need to be medical doctors to save lives,” said Dr. ![]()
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