China has completed a 60-meter-high chimney sucks in polluted air to green houses at the base. Air is then filtered through the green house to release cleaner air.
The head of the research, Cao Junji, said improvements in air quality had been observed over an area of 10 square kilometers (3.86 square miles) in the city over the past few months and the tower has managed to produce more than 10 million cubic meters (353 million cubic feet) of clean air a day since its launch.
The average reduction in PM2.5 – the fine particles in smog deemed most harmful to health – fell 15 percent during heavy pollution.
A full-sized tower would reach 500 meters (1,640 feet) high with a diameter of 200 meters (656 feet), according to a patent application they filed in 2014.
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