BEIJING (AP) — When the smog descends over northern China, turning blue skies gray and thickening the air, Cai Fujian can feel his lungs tightening and he begins to cough.
BEIJING (AP) — When the smog descends over northern China, turning blue skies gray and thickening the air, Cai Fujian can feel his lungs tightening and he begins to cough.
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