A woman wearing a mask walk through a street covered by dense smog in Harbin, northern China, Monday, Oct. 21, 2013. Visibility shrank to less than half a football field and small-particle pollution soared to a record 40 times higher than an international safety standard in one northern Chinese city as the region entered its high-smog season. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT
Nigeria declared an air pollution emergency in a major southern city on Tuesday and closed an asphalt plant there after residents complained about the fumes from its furnaces, in a country plagued by corruption and poor governance.
Residents staged a protest in Port Harcourt, a harbour city in the o
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