Scenery of rime is seen in Tianjin on Jan. 2, 2017. [Photo: Xinhua/Yue Yuewei]
Scenery of advection fog is seen in Weining county, Guizhou province on Jan. 2, 2017. [Photo: CNS/He Huan]
Scenery of advection fog is seen in Weining county, Guizhou province on Jan. 2, 2017. [Photo: CNS/He Huan]
Scenery of advection fog is seen in Weining county, Guizhou province on Jan. 2, 2017. [Photo: CNS/He Huan]
Scenery of advection fog is seen in Weining county, Guizhou province on Jan. 2, 2017. [Photo: CNS/He Huan]
Scenery of advection fog is seen in Weining county, Guizhou province on Jan. 2, 2017. [Photo: CNS/He Huan]
Scenery of advection fog is seen in Weining county, Guizhou province on Jan. 2, 2017. [Photo: CNS/He Huan]
Scenery of advection fog is seen in Weining county, Guizhou province on Jan. 2, 2017. [Photo: CNS/He Huan]
Scenery of advection fog is seen in Weining county, Guizhou province on Jan. 2, 2017. [Photo: CNS/He Huan]
Dubai is shrouded by fog on Jan. 1, 2017. [Photo/Xinhua]
Dubai is shrouded by fog on Jan. 1, 2017. [Photo/Xinhua]
Budapest is shrouded by fog on Jan. 3, 2017. [Photo/Xinhua]
Dubai is shrouded by fog on Jan. 1, 2017. [Photo/Xinhua]
Budapest is shrouded by fog on Jan. 3, 2017. [Photo/Xinhua]
Budapest is shrouded by fog on Jan. 3, 2017. [Photo/Xinhua]
Budapest is shrouded by fog on Jan. 3, 2017. [Photo/Xinhua]
Budapest is shrouded by fog on Jan. 3, 2017. [Photo/Xinhua]
Budapest is shrouded by fog on Jan. 3, 2017. [Photo/Xinhua]
Budapest is shrouded by fog on Jan. 3, 2017. [Photo/Xinhua]
Photo taken on Dec. 22, 2016 shows advection fog scenery in Xingtai City, north China's Hebei Province. (Xinhua/Chen Lei)
Photo taken on Dec. 22, 2016 shows advection fog scenery in Xingtai City, north China's Hebei Province. (Xinhua/Chen Lei)
Photo taken on Dec. 22, 2016 shows advection fog scenery in Xingtai City, north China's Hebei Province. (Xinhua/Chen Lei)
Photo taken on Dec. 22, 2016 shows advection fog scenery in Xingtai City, north China's Hebei Province. (Xinhua/Chen Lei)
Photo taken on Dec. 22, 2016 shows advection fog scenery in Xingtai City, north China's Hebei Province. (Xinhua/Chen Lei)