A Chinese couple wears protective masks while going around the Tiananmen Square on December 7, 2013. Photo: EPA

Cars or coal? Scientists split over main culprit of Beijing's air pollution

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Published: 12:45pm, 1 Jan, 2014

Updated: 2:59pm, 12 Jan, 2018

A Chinese couple wears protective masks while going around the Tiananmen Square on December 7, 2013. Photo: EPA

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