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• View of the filter screen of a 60-meter-tall air purification tower, the world's biggest air purifier, to combat smog and other air pollution in Xi'an Stock Photo - Alamy

View of the filter screen of a 60-meter-tall air purification tower, the world's biggest air purifier, to combat smog and other air pollution in Xi'an Stock Photo - Alamy

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View of the filter screen of a 60-meter-tall air purification tower, the world's biggest air purifier, to combat smog and other air pollution in Xi'an

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