Men wear masks as they sit in the metro in Prague, Czech Republic, 17 March 2020. According to media reports, the Czech government decided to impose a two-week quarantine in the country on the evening of 15 March, and ban all international travel from 16 March 2020. Currently 383 cases of the coronavirus SARS-CoV-2, which causes the Covid-19 disease, have been officially confirmed in Czech Republic. (Photo by Martin Divisek/EPA/EFE)

A man wears a gas mask as he holds a bouquet of flowers, following the outbreak of the novel coronavirus on Valentine’s Day in Hong Kong, China on February 14, 2020. (Photo by Tyrone Siu/Reuters)

A mobile phone showing the time at noon, is displayed for a photo in front of an almost empty road with low traffic, during the coronavirus disease (COVID-19) outbreak, in Wuhan, Hubei province, China, March 31, 2020. (Photo by Aly Song/Reuters)

An Iranian girls a bag of goldfish ahead of Nowruz, the Iranian New Year, in Tehran, Iran on March 17, 2021. (Photo by Majid Asgaripour/WANA (West Asia News Agency) via Reuters)

Iceland horses play on a meadow of a stud farm in Obernhain near Frankfurt, Germany, as the sun rises Thursday, July 23, 2020. (Photo by Michael Probst/AP Photo)

A model presents a creation by designer Alexis Mabille as part of his Haute Couture Spring/Summer 2020 collection show in Paris, France, January 21, 2020. (Photo by Francois Lenoir/Reuters)

Shanghai Ballet dancers wearing masks practise in a dance studio in Shanghai, China, as the country is hit by an outbreak of the novel coronavirus, February 20, 2020. (Photo by Aly Song/Reuters)

Protesters wear gas masks in the front of the Romanian Environment Ministry in Bucharest March 4, 2019, to demand better air. Dozens of people holding placards reading “Our children don't breath air anymore” gather in the front of the Environment Ministry to ask for better breathable air in Bucharest. (Photo by Daniel Mihailescu/AFP Photo)