![Blue alert engaged for dust clogging the air in Beijing(1/11)](http://www.ecns.cn/hd/2018/03/29/d6dc65dccec74f3d89816615816ef89f.jpg)
A tourist wears a mask due to the dusty weather in Beijing on March 28, 2018. (Photo: Li Hao/GT)
Visibility is low in Beijing on Wednesday as the municipal observatory issued a blue alert at 5:35 a.m. for dusty weather. The average level of PM10 particles topped 1,988 micrograms per cubic meter, according to data released by Beijing municipal environmental monitoring center.