People go out in the smoggy streets on Sunday in Bozhou, central China’s Anhui Province. (Photos: VCG)

People go out in the smoggy streets on Sunday in Bozhou.

The street is covered with smog on Sunday in Nanjing, capital city of east Chian’s Jiangsu Province.

People walk in the smog on Sunday in Nanjing.

People walk in the smog on Sunday in Zunyi, southwest China’s Guizhou Province.

A sanitation worker works in the smog on Sunday in Zunyi. (Compiled by Zhang Jian)