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China has a pretty severe pollution problem , with smog in some parts of the country so bad that it can discolor buildings and even blot out the sun. According to some estimates, high levels of air pollution in China’s cities cause up to 350,000 to 400,000 premature deaths each year. But a new project in Xi’an, one of the nation’s most severely polluted cities, aims to help — courtesy of an enormous 200-foot chimney . Unlike most chimneys, however, this one won’t add to the levels of air pollution, but rather act as an outdoor air purifying system, filtering out noxious particulate matter and blowing out clean air into the sky. The chimney is designed to remove particles termed PM2.5, ref... Full story

13 March