The Frankfurt skyline is photographed on a foggy morning as the sun rises near Kronberg, Germany, September 16, 2020. REUTERS/Kai Pfaffenbach

A woman walks along a foggy seashore to cool off amid a heatwave and the outbreak of the coronavirus disease (COVID-19) in Del Mar, California, U.S., August 19, 2020. REUTERS/Mike Blake TPX IMAGES OF THE DAY

A woman walks as the skyline of New York is seen during a foggy day from Hoboken, New Jersey, as the coronavirus disease (COVID-19) outbreak continues in New York City, U.S., March 29, 2020. REUTERS/Eduardo Munoz

A woman runs as the skyline of New York is seen during a foggy day from Hoboken, New Jersey, as the coronavirus disease (COVID-19) outbreak continues in New York City, U.S., March 29, 2020. REUTERS/Eduardo Munoz

A woman runs as the skyline of New York is seen during a foggy day from Hoboken, New Jersey, as the coronavirus disease (COVID-19) outbreak continues in New York City, U.S., March 29, 2020. REUTERS/Eduardo Munoz

A man takes a look at Lower Manhattan and One World Trade Center during a foggy day form Hoboken, New Jersey, as the coronavirus disease (COVID-19) outbreak continues in New York City, U.S., March 29, 2020. REUTERS/Eduardo Munoz

People take a look of the New York Skyline during a foggy day while regular activities move slow due the outbreak of coronavirus disease (COVID-19), in Weehawken, New Jersey, U.S., March 17, 2020. REUTERS/Eduardo Munoz

People take a look of the New York Skyline during a foggy day while regular activities move slow due the outbreak of coronavirus disease (COVID-19), in Weehawken, New Jersey, U.S., March 17, 2020. REUTERS/Eduardo Munoz

A view shows the Israeli settlement of Gilo on a foggy morning in the Israeli-occupied West Bank February 17, 2020. Picture taken February 17, 2020. REUTERS/Mustafa Ganeyeh

A view shows the city of Jerusalem on a foggy morning as seen from the Palestinian village of Al-Walaja in the Israeli-occupied West Bank February 17, 2020. Picture taken February 17, 2020. REUTERS/Mustafa Ganeyeh

A view shows the Israeli settlement of Gilo on a foggy morning in the Israeli-occupied West Bank February 17, 2020. Picture taken February 17, 2020. REUTERS/Mustafa Ganeyeh

A man rides his bicycle past St. Peter's Basilica on a foggy morning in Saint Peter's Square at the Vatican, February 17, 2020. REUTERS/Guglielmo Mangiapane

A billboard for Democratic 2020 U.S. presidential candidate Tulsi Gabbard is seen in a foggy, snow-covered corn field in Stuart, Iowa U.S. January 28, 2020. REUTERS/Rick Wilking

A billboard for Democratic 2020 U.S. presidential candidate Tulsi Gabbard is seen in a foggy, snow-covered corn field in Stuart, Iowa U.S. January 28, 2020. REUTERS/Rick Wilking

The former NBA star’s Sikorsky S-76 helicopter went down in foggy weather shortly before 10 a.m. local time in hilly terrain just outside Calabasas, California killing all nine on board, including Bryant’s 13-year-old daughter.

Passenger jets are parked at the Swiss Air Force base, which is used for arrivals and departures of participants of the the annual meeting of the World Economic Forum (WEF) in Davos, during foggy weather in Duebendorf, Switzerland January 24, 2020. REUTERS/Arnd Wiegmann

Passenger jets are parked at the Swiss Air Force base, which is used for arrivals and departures of participants of the the annual meeting of the World Economic Forum (WEF) in Davos, during foggy weather in Duebendorf, Switzerland January 24, 2020. REUTERS/Arnd Wiegmann

Hoar-frost covered trees are seen at a lake on a foggy day near Csomor, Hungary, January 17, 2020. REUTERS/Bernadett Szabo

Hoar-frost covered trees are seen at a lake on a foggy day near Csomor, Hungary, January 17, 2020. REUTERS/Bernadett Szabo

A hoar-frost covered tree is seen on a foggy day near Csomor, Hungary, January 17, 2020. REUTERS/Bernadett Szabo TPX IMAGES OF THE DAY

U.S. President Donald Trump boards Air Force One on a foggy evening as he departs Joint Base Andrews in Maryland, U.S., January 14, 2020. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY

A Secret Service agent walks toward Air Force One on a foggy afternoon before the departure of U.S. President Donald Trump from Joint Base Andrews in Maryland, U.S., January 14, 2020. REUTERS/Kevin Lamarque

Security personnel cross a road during a Republic Day parade rehearsal on a foggy winter morning in New Delhi, India, December 30, 2019. REUTERS/Adnan Abidi

People ride a boat across the Yamuna river on a foggy winter morning in New Delhi, India, December 30, 2019. REUTERS/Adnan Abidii

A woman stands on the banks of the Yamuna river on a foggy winter morning in New Delhi, India, December 30, 2019. REUTERS/Adnan Abidi

A woman wraps herself in a shawl as she walks past an army soldier during a Republic Day parade rehearsal on a foggy winter morning in New Delhi, India, December 30, 2019. REUTERS/Adnan Abidi

A man feeds seagulls as he stands on the banks of the Yamuna river on a foggy winter morning in New Delhi, India, December 30, 2019. REUTERS/Adnan Abidi TPX IMAGES OF THE DAY

Commuters at a metro station on a foggy morning in New Delhi, India, December 30, 2019. REUTERS/Danish Siddiqui

A person walks near the White House on a foggy afternoon on the eve of the House of Representatives vote to impeach the president in Washington, U.S. December 17, 2019. Picture taken December 17, 2019. REUTERS/Leah Millis

The sun emerges on a foggy day after snowfall in Almaty, Kazakhstan December 16, 2019. REUTERS/Pavel Mikheyev

The sun emerges on a foggy day after snowfall in Almaty, Kazakhstan December 16, 2019. REUTERS/Pavel Mikheyev

A bird takes off from a tree on a foggy day after snowfall in Almaty, Kazakhstan December 16, 2019. REUTERS/Pavel Mikheyev

The sun emerges on a foggy day after snowfall in Almaty, Kazakhstan December 16, 2019. REUTERS/Pavel Mikheyev

An Orthodox Church is seen during a foggy day in Minsk, Belarus December 12 , 2019. REUTERS/Vasily Fedosenko

An Orthodox Church is seen during a foggy day in Minsk, Belarus December 12 , 2019. REUTERS/Vasily Fedosenko

Women walk during a foggy day in Minsk, Belarus December 12 , 2019. REUTERS/Vasily Fedosenko

A girl walk past hoar-frost covered vegetation on a bank of the Ili river on a foggy day outside Almaty, Kazakhstan, December 1, 2019. REUTERS/Pavel Mikheyev

A man stands next to hoar-frost covered vegetation on a bank of the Ili river on a foggy day outside Almaty, Kazakhstan, December 1, 2019. REUTERS/Pavel Mikheyev

A dog stands next to hoar-frost covered vegetation on a bank of the Ili river on a foggy day outside Almaty, Kazakhstan, December 1, 2019. REUTERS/Pavel Mikheyev

A bird flies over the Ili river on a foggy day outside Almaty, Kazakhstan, December 1, 2019. REUTERS/Pavel Mikheyev

Sun rises behind the church of Saint Catherine and Saint Isaac's Cathedral on a foggy morning in Saint Petersburg, Russia December 1, 2019. REUTERS/Anton Vaganov

A woman carries a basket on her head through a field of vegetables on a foggy morning in Srinagar, November 20, 2019. REUTERS/Danish Ismail TPX IMAGES OF THE DAY

A fisherman is seen at a lake during foggy autumn day on the outskirts of Minsk, Belarus November 19, 2019. REUTERS/Vasily Fedosenko

A woman walks in a park during foggy autumn day in Minsk, Belarus November 19, 2019. REUTERS/Vasily Fedosenko

Fishermen are seen in boats on a lake during foggy autumn day on the outskirts of Minsk, Belarus November 19, 2019. REUTERS/Vasily Fedosenko

People walk during foggy autumn day in Minsk, Belarus November 19, 2019. REUTERS/Vasily Fedosenko

A woman walks at an Orthodox church during foggy autumn day in Minsk, Belarus November 19, 2019. REUTERS/Vasily Fedosenko

Autumn colours are seen on foliage during foggy autumn day in Minsk, Belarus November 19, 2019. REUTERS/Vasily Fedosenko

Snow lies on a deck chair in a garden near the village of Seefeld, Austria, November 14, 2019 REUTERS/Angelika Warmuth

Metro trains move on a foggy morning in Noida on the outskirts of New Delhi, India, November 14, 2019. REUTERS/Anushree Fadnavis

People jog on a foggy morning in Noida on the outskirts of New Delhi, India, November 14, 2019. REUTERS/Anushree Fadnavis

A Metro train moves on a foggy morning in Noida on the outskirts of New Delhi, India, November 14, 2019. REUTERS/Anushree Fadnavis

A man wearing a protective mask jogs on a foggy morning in Noida on the outskirts of New Delhi, India, November 14, 2019. REUTERS/Anushree Fadnavis

Servicemen march at an army equipment and weaponry exhibition marking the fifth anniversary of the creation of the separatist Donetsk People's Republic's armed forces on a foggy autumn day in Donetsk, Ukraine November 12, 2019. REUTERS/Alexander Ermochenko

A serviceman leans on a barrel of an armoured vehicle during an army equipment and weaponry exhibition marking the fifth anniversary of the creation of the separatist Donetsk People's Republic's armed forces on a foggy autumn day in Donetsk, Ukraine November 12, 2019. REUTERS/Alexander Ermochenko

People attend an army equipment and weaponry exhibition marking the fifth anniversary of the creation of the separatist Donetsk People's Republic's armed forces on a foggy autumn day in Donetsk, Ukraine November 12, 2019. REUTERS/Alexander Ermochenko

A woman speaks with a participant during an army equipment and weaponry exhibition marking the fifth anniversary of the creation of the separatist Donetsk People's Republic's armed forces on a foggy autumn day in Donetsk, Ukraine November 12, 2019. REUTERS/Alexander Ermochenko

Servicemen attend an army equipment and weaponry exhibition marking the fifth anniversary of the creation of the separatist Donetsk People's Republic's armed forces on a foggy autumn day in Donetsk, Ukraine November 12, 2019. REUTERS/Alexander Ermochenko

A fisherman is seen during a rainy day at the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil November 11, 2019. REUTERS/Sergio Moraes

A fisherman is seen during a rainy day at the Rodrigo de Freitas lagoon in Rio de Janeiro, Brazil November 11, 2019. REUTERS/Sergio Moraes