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Associated Press
FILE - In this Jan. 10, 2012 file photo, a man rides an electric bike crossing a street shrouded by haze in Beijing. A senior Chinese environmental official told foreign embassies on Tuesday, June 5, 2012 to stop publishing their own reports on air quality in China, a clear reference to a popular U.S. Embassy Twitter feed that tracks pollution in smoggy Beijing. (AP Photo/Andy Wong, File)

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