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)

A policeman wearing a coronavirus-themed outfit composed of helmet, mace and shield, gestures towards a vendor (L) at a market to raise awareness about social distancing, during a government-imposed nationwide lockdown as a preventive measure against the COVID-19 coronavirus in Chennai, on April 2, 2020. (Photo by Arun Sankar/AFP Photo)

A lady wearing a mask feeds pigeons in St James' Park, as the spread of the coronavirus disease (COVID-19) continues, London, Britain, April 5, 2020. (Photo by Henry Nicholls/Reuters)

A masked tourist poses for a souvenir photo next to a graffiti titled “Mobile World Virus” depicting “La Gioconda”, aka Mona Lisa, with a mobile phone and a medical mask, by urban artist TVBoy, close to the Sant Jaume square in Barcelona, Spain, 09 March 2020. Barcelona's Deputy Mayor and two town councillors are in quarantine after they were in contact with a City Hall's worker who was tested positive for the COVID-19 coronavirus. (Photo by Quique Garcia/EPA/EFE)

Rachel Miner, 15, left, of Emmetsburg, Iowa, sits with Carlotta Haas, 15, a foreign exchange student from Duesseldorf, Germany, who had been living with Miner and her family but was called home, as they waited for her flight Wednesday, March 25, 2020, in at Minneapolis-St. Paul International Airport in Minneapolis. (Photo by Anthony Souffle/Star Tribune via AP Photo)

A man wears a protective face mask as he walks along the main market in downtown after the government eased the restrictions on movement aimed at containing the spread of the coronavirus disease (COVID-19), in Amman, Jordan on April 29, 2020. (Photo by Muhammad Hamed/Reuters)

Local youth representatives dressed a Stormtrooper and Darth Vader (L-in black) from the Star Wars film franchise patrol in a wooden boat around a submerged village to remind residents to stay at home during the enhanced community quarantine in suburban Manila on May 6, 2020, as part of government's efforts to combat the spread of the COVID-19 coronavirus. (Photo by Ted Aljibe/AFP Photo)

Grave diggers wearing personal protective equipment (PPE) walk away after burying a person, who presumably died of the coronavirus disease (COVID-19), in the special purpose section of a graveyard on the outskirts of Saint Petersburg, Russia on May 13, 2020. (Photo by Anton Vaganov/Reuters)