A woman wearing a protective mask has her picture taken just after a flag-raising ceremony amid heavy smog at the Tiananmen Square in Beijing

A woman wearing a protective mask has her picture taken just after a flag-raising ceremony amid heavy smog at the Tiananmen Square in Beijing

A woman wearing a protective mask has her picture taken just after a flag-raising ceremony amid heavy smog at the Tiananmen Square, after the city issued its first ever “red alert” for air pollution, in Beijing December 9, 2015. REUTERS/Damir Sagolj

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