Leszek Kowalik presents Respisave, a remote-controlled ventilator that will allow doctors to monitor and adjust the device for their patients at a distance, in a bid to make medical personnel safer amidst the coronavirus disease (COVID-19) outbreak, at Centre for Medical Simulation MedExcellence in Warsaw, Poland, June 8, 2020. Picture taken June 8, 2020. REUTERS/Kacper Pempel 

Opposition supporters wearing protective face masks and respirators amid the coronavirus disease (COVID-19) outbreak hold slippers during a rally to support their potential candidates in the upcoming presidential election in Minsk, Belarus, May 31, 2020. Picture taken May 31, 2020. REUTERS/Vasily Fedosenko 

Pediatric specialist Norma Raul attaches a respirator system for training reasons to a dummy at the El Cruce hospital, as the spread of the coronavirus disease (COVID-19) continues, in Florencio Varela, on the outskirts of Buenos Aires, Argentina May 14, 2020. REUTERS/Agustin Marcarian 

Pediatric specialist Norma Raul attaches a respirator system for training reasons to a dummy at the El Cruce hospital, as the spread of the coronavirus disease (COVID-19) continues, in Florencio Varela, on the outskirts of Buenos Aires, Argentina May 14, 2020. REUTERS/Agustin Marcarian 

A doctor holds a respirator to be used on a patient of Emergency Rescue Service (SAMU) during the spread of the coronavirus disease (COVID-19) in Santo Andre, Sao Paulo State, Brazil, May 12, 2020. REUTERS/Rahel Patrasso 

A FFP2 Respirator mask lies on a table in the restaurant "Tuscolo" that reopened today, following weeks of closure due to the global outbreak of the coronavirus disease (COVID-19), in Bonn, Germany, May 11, 2020. REUTERS/Wolfgang Rattay 

Members of Russia's National Guard wearing respirators patrol a street on Victory Day, which marks the anniversary of the victory over Nazi Germany in World War Two, amid the outbreak of the coronavirus disease (COVID-19) in Moscow, Russia May 9, 2020. REUTERS/Tatyana Makeyeva 

A nurse demonstrates how to activate a respirator as the hospital prepares for the coronavirus disease (COVID-19) outbreak, at the Karen hospital near Nairobi, Kenya, April 6, 2020. Picture taken April 6, 2020. REUTERS/Baz Ratner 

A nurse demonstrates how to activate a respirator as the hospital prepares for the coronavirus disease (COVID-19) outbreak, at the Karen hospital near Nairobi, Kenya, April 6, 2020. Picture taken April 6, 2020. REUTERS/Baz Ratner 

A nurse demonstrates how to activate a respirator as the hospital prepares for the coronavirus disease (COVID-19) outbreak, at the Karen hospital near Nairobi, Kenya, April 6, 2020. Picture taken April 6, 2020. REUTERS/Baz Ratner 

A medical staff member demonstrates how to activate a respirator as the hospital prepares for the coronavirus disease (COVID-19) outbreak, at the Karen hospital near Nairobi, Kenya, April 6, 2020. Picture taken April 6, 2020. REUTERS/Baz Ratner 

Medical staff members demonstrate how to activate a respirator as the hospital prepares for the coronavirus disease (COVID-19) outbreak, at the Karen hospital near Nairobi, Kenya, April 6, 2020. Picture taken April 6, 2020. REUTERS/Baz Ratner 

A man with a protective respirator on his neck walks with dogs on an empty public beach amid the coronavirus disease (COVID-19) outbreak in Kiev, Ukraine May 5, 2020. REUTERS/Valentyn Ogirenko 

Delhi’s city-wide lockdown to curb the spread of the novel coronavirus began on March 22. Since then, the daily average concentration of PM2.5 has been lower than the same time period in 2019. 

Senior nurse anesthesiologist Nilu Patel participates in a candlelight vigil at her shift change at UC Irvine Medical Center over the need for more N95 respirators and protective gear during the outbreak of the coronavirus disease (COVID-19) in Irvine, California, U.S., April 20, 2020. REUTERS/Mike Blake 

Registered nurses at UC Irvine Medical Center hold a candlelight vigil at their shift change to describe conditions and the need for more N95 respirators and protective gear during the outbreak of the coronavirus disease (COVID-19) in Irvine, California, U.S., April 20, 2020. REUTERS/Mike Blake 

Senior nurse anesthesiologist Nilu Patel participates in a candlelight vigil at her shift change at UC Irvine Medical Center over the need for more N95 respirators and protective gear during the outbreak of the coronavirus disease (COVID-19) in Irvine, California, U.S., April 20, 2020. REUTERS/Mike Blake 

Registered nurses at UC Irvine Medical Center hold a candlelight vigil at their shift change to describe conditions and the need for more N95 respirators and protective gear during the outbreak of the coronavirus disease (COVID-19) in Irvine, California, U.S., April 20, 2020. REUTERS/Mike Blake 

Senior nurse anesthesiologist Nilu Patel participates in a candlelight vigil at her shift change at UC Irvine Medical Center over the need for more N95 respirators and protective gear during the outbreak of the coronavirus disease (COVID-19) in Irvine, California, U.S., April 20, 2020. REUTERS/Mike Blake 

Registered nurses at UC Irvine Medical Center hold a candlelight vigil at their shift change to describe conditions and the need for more N95 respirators and protective gear during the outbreak of the coronavirus disease (COVID-19) in Irvine, California, U.S., April 20, 2020. REUTERS/Mike Blake 

Registered nurses at UC Irvine Medical Center hold a candlelight vigil at their shift change to describe conditions and the need for more N95 respirators and protective gear during the outbreak of the coronavirus disease (COVID-19) in Irvine, California, U.S., April 20, 2020. REUTERS/Mike Blake 

Registered nurses at UC Irvine Medical Center hold a candlelight vigil at their shift change to describe conditions and the need for more N95 respirators and protective gear during the outbreak of the coronavirus disease (COVID-19) in Irvine, California, U.S., April 20, 2020. REUTERS/Mike Blake 

Registered nurses at UC Irvine Medical Center hold a candlelight vigil at their shift change to describe conditions and the need for more N95 respirators and protective gear during the outbreak of the coronavirus disease (COVID-19) in Irvine, California, U.S., April 20, 2020. REUTERS/Mike Blake 

Registered nurses at UC Irvine Medical Center hold a candlelight vigil at their shift change to describe conditions and the need for more N95 respirators and protective gear during the outbreak of the coronavirus disease (COVID-19) in Irvine, California, U.S., April 20, 2020. REUTERS/Mike Blake 

Registered nurses at UC Irvine Medical Center hold a candlelight vigil at their shift change to describe conditions and the need for more N95 respirators and protective gear during the outbreak of the coronavirus disease (COVID-19) in Irvine, California, U.S., April 20, 2020. REUTERS/Mike Blake TPX IMAGES OF THE DAY 

Nurse Samantha Poirier, 28-year-old, checks an artificial respirator as she treats a patient suffering from coronavirus disease (COVID-19) in the Intensive Care Unit (ICU) at the Clinique de l'Estree private hospital in Stains near Paris as the spread of the coronavirus disease continues in France, April 20, 2020. REUTERS/Benoit Tessier TPX IMAGES OF THE DAY 

Nurse Samantha Poirier, 28-year-old, checks an artificial respirator as she treats a patient suffering from coronavirus disease (COVID-19) in the Intensive Care Unit (ICU) at the Clinique de l'Estree private hospital in Stains near Paris as the spread of the coronavirus disease continues in France, April 20, 2020. REUTERS/Benoit Tessier 

Volunteer dentists convert snorkel masks into respirators, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina 

A view shows snorkel masks to be converted into respirators, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina 

Volunteer dentists assemble snorkel masks and convert them into respirators, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina 

Volunteer dentists assemble snorkel masks and convert them into respirators, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina 

A volunteer dentist works on converting a snorkel mask into a respirator, using 3D printing technology, to reinforce hospitals and help patients suffering from the coronavirus disease (COVID-19) in Algiers, Algeria April 15, 2020. Picture taken April 15, 2020. REUTERS/Ramzi Boudina 

Doctor Steffen Seemann and paramedic Daniel Rowan move a patient under artificial respiration to rescue helicopter "Christoph Mittelhessen" before his flight into a clinic in Bad Wildungen, Germany, April 16, 2020, as the spread of the coronavirus disease (COVID-19) continues. REUTERS/Kai Pfaffenbach 

Doctor Steffen Seemann (L) and paramedic Daniel Rowan attend a patient under artificial respiration before his transport with rescue helicopter "Christoph Mittelhessen" from a clinic in Bad Homburg to Bad Wildungen, Germany, April 16, 2020, as the spread of the coronavirus disease (COVID-19) continues. REUTERS/Kai Pfaffenbach 

Doctor Steffen Seemann and paramedic Daniel Rowan (L) disinfect their equipment after transporting a patient under artificial respiration from rescue helicopter "Christoph Mittelhessen" into a clinic in Bad Wildungen, Germany, April 16, 2020, as the spread of the coronavirus disease (COVID-19) continues. REUTERS/Kai Pfaffenbach 

A technician from FCA (Fiat Chrysler Automobiles) assembly plant fixes respirators for use in hospitals at the company's lab, amid the coronavirus disease (COVID-19) outbreak, in Betim near Belo Horizonte, Brazil, April 8, 2020. REUTERS/Washington Alves 

Technicians from FCA (Fiat Chrysler Automobiles) assembly plant fix respirators for use in hospitals at the company's lab, amid the coronavirus disease (COVID-19) outbreak, in Betim near Belo Horizonte, Brazil, April 8, 2020. REUTERS/Washington Alves 

A technician from FCA (Fiat Chrysler Automobiles) assembly plant fixes respirators for use in hospitals at the company's lab, amid the coronavirus disease (COVID-19) outbreak, in Betim near Belo Horizonte, Brazil, April 8, 2020. REUTERS/Washington Alves 

Technicians from FCA (Fiat Chrysler Automobiles) assembly plant fix respirators for use in hospitals at the company's lab, amid the coronavirus disease (COVID-19) outbreak, in Betim near Belo Horizonte, Brazil, April 8, 2020. REUTERS/Washington Alves 

Technicians from FCA (Fiat Chrysler Automobiles) assembly plant fix respirators for use in hospitals at the company's lab, amid the coronavirus disease (COVID-19) outbreak, in Betim near Belo Horizonte, Brazil, April 8, 2020. REUTERS/Washington Alves 

Technicians from FCA (Fiat Chrysler Automobiles) assembly plant fix respirators for use in hospitals at the company's lab, amid the coronavirus disease (COVID-19) outbreak, in Betim near Belo Horizonte, Brazil, April 8, 2020. REUTERS/Washington Alves 

Technicians from FCA (Fiat Chrysler Automobiles) assembly plant fix respirators for use in hospitals at the company's lab, amid the coronavirus disease (COVID-19) outbreak, in Betim near Belo Horizonte, Brazil, April 8, 2020. REUTERS/Washington Alves 

Technicians from FCA (Fiat Chrysler Automobiles) assembly plant fix respirators for use in hospitals at the company's lab, amid the coronavirus disease (COVID-19) outbreak, in Betim near Belo Horizonte, Brazil, April 8, 2020. REUTERS/Washington Alves 

Technicians from FCA (Fiat Chrysler Automobiles) assembly plant fix respirators for use in hospitals at the company's lab, amid the coronavirus disease (COVID-19) outbreak, in Betim near Belo Horizonte, Brazil, April 8, 2020. REUTERS/Washington Alves 

Instacart employee Eric Cohn, 34, waits in line in a Fry's grocery store after preparing a delivery order while wearing a respirator mask to help protect himself and slow the spread of the coronavirus disease (COVID-19) in Tucson, Arizona, U.S., April 4, 2020. Picture taken April 4, 2020. REUTERS/Cheney Orr 

Instacart employee Eric Cohn, 34, heads to his car outside a Safeway grocery store while wearing a respirator mask to help protect himself and slow the spread of the coronavirus disease (COVID-19) in Tucson, Arizona, U.S., April 4, 2020. Picture taken April 4, 2020. REUTERS/Cheney Orr 

Instacart employee Eric Cohn, 34, loads an order into his car outside a Fry's grocery store while wearing a respirator mask to help protect himself and slow the spread of the coronavirus disease (COVID-19) in Tucson, Arizona, U.S., April 4, 2020. Picture taken April 4, 2020. REUTERS/Cheney Orr 

Instacart employee Eric Cohn, 34, navigates a Safeway grocery store while preparing a delivery order while wearing a respirator mask to help protect himself and slow the spread of the coronavirus disease (COVID-19) in Tucson, Arizona, U.S., April 4, 2020. Picture taken April 4, 2020. REUTERS/Cheney Orr 

Instacart employee Eric Cohn, 34, picks out a cart outside a Fry's grocery store while wearing a respirator mask to help protect himself and slow the spread of the coronavirus disease (COVID-19) in Tucson, Arizona, U.S., April 4, 2020. Picture taken April 4, 2020. REUTERS/Cheney Orr 

Instacart employee Eric Cohn, 34, sprays his gloves with disinfectant while wearing a respirator mask to help protect himself and slow the spread of the coronavirus disease (COVID-19) in Tucson, Arizona, U.S., April 4, 2020. Picture taken April 4, 2020. REUTERS/Cheney Orr 

Instacart employee Eric Cohn, 34, searches for an item for a delivery order in a Safeway grocery store while wearing a respirator mask to help protect himself and slow the spread of the coronavirus disease (COVID-19) in Tucson, Arizona, U.S., April 4, 2020. Picture taken April 4, 2020. REUTERS/Cheney Orr 

Instacart employee Eric Cohn, 34, sprays his phone with disinfectant while wearing a respirator mask to help protect himself and slow the spread of the coronavirus disease (COVID-19) in Tucson, Arizona, U.S., April 4, 2020. Picture taken April 4, 2020. REUTERS/Cheney Orr 

Instacart employee Eric Cohn, 34, uses his phone to scan an item for a delivery order he is preparing from Fry's grocery store while wearing a respirator mask to help protect himself and slow the spread of the coronavirus disease (COVID-19) in Tucson, Arizona, U.S., April 4, 2020. Picture taken April 4, 2020. REUTERS/Cheney Orr 

Instacart employee Eric Cohn, 34, delivers groceries to a residence while wearing a respirator mask to help protect himself and slow the spread of the coronavirus disease (COVID-19) in Tucson, Arizona, U.S., April 4, 2020. Picture taken April 4, 2020. REUTERS/Cheney Orr 

Instacart employee Eric Cohn, 34, looks for an item for a delivery order in a Safeway grocery store while wearing a respirator mask to help protect himself and slow the spread of the coronavirus disease (COVID-19) in Tucson, Arizona, U.S., April 4, 2020. Picture taken April 4, 2020. REUTERS/Cheney Orr 

Instacart employee Eric Cohn, 34, exits a Sprouts Farmers Market while wearing a respirator mask to help protect himself and slow the spread of coronavirus disease (COVID-19) in Tucson, Arizona, U.S., April 4, 2020. Picture taken April 4, 2020. REUTERS/Cheney Orr 

FFP2 respiration masks are seen after German luxury carmaker BMW donated relief goods to the Federal Agency for Technical Relief (THW), as the spread of the coronavirus disease (COVID-19) continues in Munich, Germany, April 8, 2020. REUTERS/Andreas Gebert 

A voter wearing a respirator waits to enter a polling station at Hamilton High School during the presidential primary election, held amid the coronavirus disease (COVID-19) outbreak, in Milwaukee, Wisconsin, U.S., April 7, 2020. REUTERS/Daniel Acker 

A nurse tests a respirator called OxyGEN, which is to be sent to hospitals, during the coronavirus disease (COVID-19) outbreak, at the SEAT car factory of Martorell, near Barcelona, Spain April 7, 2020. REUTERS/Nacho Doce 

A nurse tests a respirator called OxyGEN, which is to be sent to hospitals, during the coronavirus disease (COVID-19) outbreak, at the SEAT car factory of Martorell, near Barcelona, Spain April 7, 2020. REUTERS/Nacho Doce