‘Airpocalypse’ in China

“China is spluttering under sky-high pollution levels which have brought factories, roads and schools to a standstill for several days. State news agency Xinhua reported [on Tuesday December 20] that 23 cities in the Middle Kingdom have activated red alerts, the most severe weather warning. Xinhua also cited Beijing Capital International Airport's official Weibo account, which said that as of 2pm Tuesday, 273 flights had been cancelled.”  Culled from https://www.yahoo.com/finance/news/three-consequences-china-airpocalypse-154637380.html