Afghan men ride a donkey cart during a heavy fog in Kabul, Afghanistan, Thursday, November 26, 2020. (Photo by Rahmat Gul/AP Photo)





Boatmen row their boats in the waters of river Jhelum amid foggy condition in Srinagar on December 2, 2020. (Photo by Tauseef Mustafa/AFP Photo)





A boxing training session in the fog on Bromley Common on November 27, 2020 in Bromley, England. The Met Office issued a yellow weather warning for the UK today for freezing fog patches. (Photo by Dan Kitwood/Getty Images)





Pedestrians walk near a skating rink past signs requesting to wear protective face masks and to keep a social distance amid the coronavirus disease (COVID 19) outbreak, as heavy fog covers a square named after Soviet state founder Vladimir Lenin in Stavropol, Russia on December 1, 2020. (Photo by Eduard Korniyenko/Reuters)





Cranes fly above a lake during the migration season on a foggy morning at Hula Nature Reserve, in northern Israel on November 17, 2020. (Photo by Ronen Zvulun/Reuters)





A woman joggs during foggy weather in a forest, in Zurich, Switzerland on November 26, 2020. (Photo by Arnd Wiegmann/Reuters)





Birds fly amid heavy smoggy conditions in Lahore, Pakistan on December 7, 2020. (Photo by Arif Ali/AFP Photo)





CSKA Sofia plays against Young Boys in the Europa League using an orange football amongst the foggy weather conditions at Vasil Levski National Stadium, Sofia, Bulgaria, November 26, 2020. (Photo by Stoyan Nenov/Reuters)





Skyscrapers in the City of London financial district are seen on a foggy morning, amid the spread of the coronavirus disease (COVID-19), London, Britain, December 7, 2020. (Photo by Toby Melville/Reuters)





Undated photo issued by the International Union for Conservation of Nature, showing European bison. Climate change is now the biggest threat to natural World Heritage, according to a report published Thursday December 10, 2020, by IUCN, although it also showed the more promising revelation that populations of the European bison, Europe’s largest land mammal, have improved. (Photo by Rafał Kowalczyk/IUCN via AP Photo)





Morning fog covers the landscape around the Castle of Somosko, near Salgotarjan, Hungary, 24 November 2020. (Photo by Peter Komka/EPA/EFE)





A couple walk in the Retiro park in Madrid on November 17, 2020 as a thick fog falls on the Spanish capital. (Photo by Gabriel Bouys/AFP Photo)





Clouds and fog are seen over villages in the Taunus hills near Frankfurt, Germany, Tuesday, November 24, 2020. (Photo by Michael Probst/AP Photo)





A Kashmiri boatman rows his boat in the interiors of the Dal Lake surrounded by dense fog on a cold morning in Srinagar, Indian controlled Kashmir, Indian controlled Kashmir, Thursday, December 3, 2020. (Photo by Dar Yasin/AP Photo)





An Icelandic horse stands in a paddock of a stud farm in Wehrheim near Frankfurt, Germany, while others graze in the background on a foggy Saturday, November 28, 2020. (Photo by Michael Probst/AP Photo)