In this Dec. 22, 2016 photo, Cai Fujian speaks during an interview as he visits the Temple of Heaven with friends in Beijing. When the smog descends over northern China, turning blue skies gray and thickening the air, 65-year-old Cai can feel his lungs tightening. He begins to cough. For weeks at a time, China's smog transforms cities across the industrial north into quiet, gray shells of their normal selves. The Associated Press visited several spots in Beijing in late December during and after a smog "red alert," and used a 360-degree camera to record the difference at each location. (AP Photo/Nomaan Merchant)
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