Paramilitary police officers wearing masks patrol in the smog at Tiananmen Square in Beijing

Paramilitary police officers wearing masks patrol in the smog at Tiananmen Square in Beijing

Paramilitary police officers wearing masks patrol in the smog at Tiananmen Square after a red alert was issued for heavy air pollution in Beijing, China, December 20, 2016. Reuters/Jason Lee

December 20, 2016 9:46 AM (UTC+8)