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China Issues National Red Alert Amid Heavy Smog
China issued its first-ever national red alert for severe smog after 24 of its cities had issued red alerts for air pollution problems.
A woman wears a mask as she sits on a public bus amid heavy smog in downtown Shanghai on Jan. 3.
Although it is the world's biggest carbon emitter, China plans to reduce hazardous emissions from coal-fired power plants by 50 percent over the next five years, and says its overall emissions will peak by about 2030 before starting to decline.
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