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Air Quality Worsens in China’s Henan Province, Improves Elsewhere

  Air pollution in China's heavy-industrial province of Henan worsened in December even as other regions improved, official data showed, with its cities hit by...

A New Culprit Is Identified in China’s Choking Smog

  BEIJING — Scientists have found a new culprit contributing to China’s notorious wintertime smog, and controlling it could help sustain the significant improvements in...