![Blue alert engaged for dust clogging the air in Beijing(11/11)](http://www.ecns.cn/hd/2018/03/29/b4ba5649cc854af4ab0d8aaeb11e9215.jpg)
Tourists pose for photos while wearing masks due to the dust at Tiananmen Square in Beijing on March 28, 2018. (Photo: Li Hao/GT)
Tourists pose for photos while wearing masks due to the dust at Tiananmen Square in Beijing on March 28, 2018. (Photo: Li Hao/GT)