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A view of a 60-meter-tall air purification tower, the world's biggest air purifier, to combat smog and other air pollution in Xi'an city, northwest Ch Stock Photo - Alamy
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![An aerial view of a 60-meter-tall air purification tower, the world's biggest air purifier, to combat smog and other air pollution in Xi'an city, nort Stock Photo - Alamy An aerial view of a 60-meter-tall air purification tower, the world's biggest air purifier, to combat smog and other air pollution in Xi'an city, nort Stock Photo - Alamy](https://c8.alamy.com/zooms/6/f81b013c86ee46078347bf6665855cca/w6dc9g.jpg)
An aerial view of a 60-meter-tall air purification tower, the world's biggest air purifier, to combat smog and other air pollution in Xi'an city, nort Stock Photo - Alamy
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