A red alert for air pollution was issued in 23 cities in northern China, affecting severely schools and factories in Beijing.
원문출처 : http://www.cnn.com/videos/world/2016/12/19/china-smog-red-alert-sfc-orig.cnn
원문출처 : http://www.cnn.com/videos/world/2016/12/19/china-smog-red-alert-sfc-orig.cnn