A vendor wears mask to sell national flag and selfie stick at Tiananmen Square during a haze day in Beijing city, China, 08 December 2015. Beijing has issued its first red alert for air pollution under a four-tier emergency response system created in October 2013. The red alert which is the most serious level for Air Quality Index (AQI), last from 7 a.m. on 08 December to 12 a.m. on 10 December. (Photo by Wu Hong/EPA)
