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Beijing's toxic smog was years in the making, had many sources


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People visit the Bund in front of Pudong Lujiazui financial area on a hazy day in Shanghai January 16, 2013. Chinese media said on Monday the government had to take urgent action to tackle air pollution, which has blanketed parts of the country at dangerous levels in recent days, and one newspaper called for a re-think of a ''fixation'' on economic growth. REUTERS/Aly Song