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Hazardous air pollution prompts 'red alerts' in northern China cities | |
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December 20, 2016 Air pollution in north China reached hazardous levels for the fourth straight day on resurgent coal output in the country. Source: http://www.cnbc.com/2016/12/20/northern-china-suffocates-under-blanket-of-hazardous-air-pollution.html |
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