Children in Hiroshima, Japan, wearing masks to combat the odour of death after the city was destroyed by the first atom bomb. (Photo by Keystone/Getty Images). 1945

A masked Bulgarian dancer takes part in the second competition day of the 24th International Festival of Masquerade Games “Surva” in the town of Pernik, Bulgaria Saturday, January 31, 2015. Some 5,000 people are expected to take part in the three-day festival devoted to an ancient Bulgarian pagan rite. Surva is performed by costumed men, some in sheepskin, or other colorful garments, bells and masks, who walk around and dance to scare away the evil spirits, in hope to provide a good harvest, health, fertility, and happiness. (Photo by Valentina Petrova/AP Photo)

A participant wearing a tiger mask performs during the “Paseo del Pendon”, a traditional artistic march in Chilpancingo, December 21, 2014. The “Paseo del Pendon” (walk banner) is a traditional celebration in the streets of Chilpancingo to mark the begin of the the year-end festivities in the city. (Photo by Jorge Dan Lopez/Reuters)

Masked penitents holds their crosses during spring “Romeria Cruceros de Arce”, in Roncesvalles, northern Spain, Sunday, May 10, 2015. Every year on the second Sunday in spring, people with crosses march from their small Pyrenees towns to Roncesvalles Church in tribute of the Virgin. (Photo by Alvaro Barrientos/AP Photo)

A masked protester talks to a soldier during clashes after the funeral of Brig. Gen. Wissam al-Hassan October 21, 2012. Lebanese soldiers fired guns and tear gas to push back hundreds of protesters who broke through a police cordon and tried to storm the government headquarters in Beirut. (Photo by Hussein Malla/Associated Press)

Tourists wear protective masks in Sanur, Bali, Indonesia, 15 March 2020. Indonesia has around 80 active cases of Covid-19. More than 70,000 people worldwide have recovered from coronavirus, nearly half of the total infections recorded since the outbreak began. (Photo by Made Nagi/EPA/EFE)

Argentinian dancer Maria Belen Ciaschi, stranded in Lebanon due to COVID-19 coronavirus pandemic, dances flamenco to the music played by Uruguayan singer Walter Javier Maulelo while both wearing a mask on a seafront boardwalk in the northern coastal city of Batroun, on April 15, 2020. (Photo by Ibrahim Chalhoub/AFP Photo)

Wearing a protective mask to curb the spread of the new coronavirus a man attends a memorial for those who have died from COVID-19 worldwide, at Rio's Christ the Redeemer statue in Rio de Janeiro, Brazil, Wednesday, July 1, 2020. (Photo by Leo Correa/AP Photo)