fog

Indian students travel on a horse cart surrounded by fog in Jammu, India, Thursday, Dec.18, 2014. As winter sets in, thick fog engulfs most of north India early mornings.

Channi Anand/AP

Students travel via horse and cart surrounded by fog in Jammu, India. As winter sets in, thick fog engulfs most of north India early mornings

Men play cricket in a public park on a foggy morning in Kolkata

Rupak De Chowdhuri/Reuters

Men play cricket in a public park on a foggy morning in Kolkata, India on Friday

Kashmiris walk towards a polling station to cast their votes on a cold and foggy morning in Kulangham, some 68 kilometers north of Srinagar, India on Tuesday. The second phase of the five-phased state elections is being held Tuesday.

Dar Yasin/AP

Kashmiris walk towards a polling station to cast their votes on a cold and foggy morning in Kulangham, some 68km north of Srinagar, India, on Tuesday.

An Indian jockey leads his horse off the track after attending a practice session

Dibyangshu Sarkar/AFP/Getty Images

An Indian jockey leads his horse off the track after attending a practice session at The Royal Calcutta Turf Club on a foggy morning in Kolkata on Friday

The Canary Wharf financial district and central London emerge from morning fog in this aerial photograph released by the Metropolitan Police in London

Metropolitan Police/Reuters

The Canary Wharf financial district emerges from Thursday’s morning fog , with central London in the background

Fog covers the valleys in front of the Alpine panorama pictured from the Auerberg mountain near Stoetten, southern Germany.

Karl-Josef Hildenbrand/AP

Fog covers the valleys in front of the Alpine panorama pictured from the Auerberg mountain near Stoetten, southern Germany

Fog rises from the valley and the church...Fog rises from the valley and the church of Marktoberdorf, southern Germany, as in background can be seen an Alps panorama on January 19, 2014.       AFP PHOTO / DPA / KARL-JOSEF HILDENBRAND / GERMANY OUTKARL-JOSEF HILDENBRAND/AFP/Getty Images

Josef Hildenbrand/AFP

Fog rises from the valley around the church of Marktoberdorf, southern Germany.

Villagers walk home carrying water collected from the Kuakhai River in on a foggy morning in Bhubaneswar, India, Thursday, Dec. 19, 2013.

Biswaranjan Rout/AP

Villagers walk home carrying water collected from the Kuakhai River on a foggy morning in Bhubaneswar, India 

Soccer goal posts are seen in the autumn mist at Dukes Meadows in Chiswick, west London...Soccer goal posts are seen in the autumn mist at Dukes Meadows in Chiswick, west London November 13, 2013. REUTERS/Toby Melville

Toby Melville/Reuters

Goalposts in the autumn mist at Dukes Meadows in Chiswick, west London, early on Wednesday morning. 

Morning fog covers the view to sail boat...Morning fog covers the view to sail boats that anchor at the river Elbe in Dresden, south-eastern Germany. AFP PHOTO / DPA/ ARNO BURGI    GERMANY OUTARNO BURGI/AFP/Getty Images

Arno Burgi/AFP/Getty

Morning fog covers the view to sail boats that anchor at the river Elbe in Dresden, southeast Germany