A cyclist wears a respirator mask on a polluted day in Beijing, China, March 10, 2023. REUTERS/Thomas Peter 

Smart iSportWeaR sunglasses by Taiwan's Industrial Technology Research Institute, that measure heart rate and respiration, are displayed during the CES Unveiled press event at CES 2023, an annual consumer electronics trade show, in Las Vegas, Nevada, U.S. January 3, 2023. REUTERS/Steve Marcus 

N95 respirators are stacked for packaging at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

Workers produce N95 respirators at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

Workers produce N95 respirators at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

N95 respirators are stacked for during manufacturing at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

Workers package N95 respirators at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

A worker prepares N95 respirators for packaging at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

Workers produce N95 respirators at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

N95 respirators are stacked for during manufacturing at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

Workers produce N95 respirators at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

Workers produce N95 respirators at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

Workers produce N95 respirators at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

Workers produce N95 respirators at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

A workers inspects an N95 respirator during manufacturing at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

Workers package N95 respirators at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

A workers inspects an N95 respirator at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

Workers package N95 respirators at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

Workers produce N95 respirators at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

An N95 respirator flies out of a machine as a worker stacks masks during production at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

Workers produce N95 respirators at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

Workers produce N95 respirators at Protective Health Gear (PHG) in Paterson, New Jersey, U.S., January 14, 2022. REUTERS/Brendan McDermid 

A Skanska contractor wearing a 3M full-face respirator works on top of a lift during the construction works of the Sixth Street Viaduct replacement project in Downtown Los Angeles, California, U.S., August 11, 2021. REUTERS/Bing Guan 

A Skanska contractor adjusts his helmet after removing his 3M respirator during the construction works of the Sixth Street Viaduct replacement project in Downtown Los Angeles, California, U.S., August 11, 2021. REUTERS/Bing Guan 

A patient of helicopter "Christoph Giessen" of Johanniter air rescue breathes through a respirator prior to his transport to Wuerzburg from Aschaffenburg, as the spread of the coronavirus disease (COVID-19) continues, in Aschaffenburg, Germany, April 25, 2021. REUTERS/Kai Pfaffenbach 

A patient on helicopter "Christoph Giessen" of Johanniter air rescue breathes through an respirator prior to his transport to Wuerzburg from Aschaffenburg, as the spread of the coronavirus disease (COVID-19) continues, in Aschaffenburg, Germany, April 25, 2021. REUTERS/Kai Pfaffenbach 

A view shows Moroccan respirator machines at a Laboratory in SERMP, a Casablanca-based company that supplies parts to French aircraft engine maker Safran, in Casablanca, Morocco February 23, 2021. Picture taken February 23, 2021. REUTERS/Abdelhak Balhaki 

A technician works on a medical respirator in SERMP, a Casablanca-based company that supplies parts to French aircraft engine maker Safran, in Casablanca, Morocco February 23, 2021. Picture taken February 23, 2021. REUTERS/Abdelhak Balhaki 

A technician works on a medical respirator in SERMP, a Casablanca-based company that supplies parts to French aircraft engine maker Safran, in Casablanca, Morocco February 23, 2021. Picture taken February 23, 2021. REUTERS/Abdelhak Balhaki 

A protester wears a respirator as Pro-Trump supporters rally to contest the certification of the 2020 U.S. presidential election results by the U.S. Congress, at the U.S. Capitol Building in Washington, D.C., U.S. January 6, 2021. Picture taken January 6, 2021. REUTERS/Ahmed Gaber 

A person wearing a protective respirator enters a queue in the city centre amidst the tightening of regulations to curb the spread of the coronavirus disease (COVID-19) in Sydney, Australia, December 30, 2020. REUTERS/Loren Elliott 

A person wearing a protective respirator enters a queue in the city centre amidst the tightening of regulations to curb the spread of the coronavirus disease (COVID-19) in Sydney, Australia, December 30, 2020. REUTERS/Loren Elliott 

A physiotherapist moves a respirator from a coronavirus disease (COVID-19) positive patient at the ICU of Hospital Sao Paulo in Sao Paulo, Brazil December 11, 2020. REUTERS/Amanda Perobelli 

A 3M logo is seen atop a Versaflo TR-300+ powered air purifying respirator hood as Nurse Evan Brost puts on personal protective equipment (PPE) before entering a patient room in a wing housing coronavirus disease (COVID-19) patients at UW Health University Hospital in Madison, Wisconsin, U.S. November 18, 2020. REUTERS/Daniel Acker 

Nursing Assistant Brittany Digman wears a 3M Versaflo TR-300+ powered air purifying respirator as she prepares to enter the room of a coronavirus disease (COVID-19) patient being treated at UW Health University Hospital in Madison, Wisconsin, U.S. November 18, 2020. REUTERS/Daniel Acker 

Nurse Alex Krajek puts on a 3M Versaflo TR-300+ powered air purifying respirator as he prepares to enter a patient room in a wing housing coronavirus disease (COVID-19) patients at UW Health University Hospital in Madison, Wisconsin, U.S. November 18, 2020. REUTERS/Daniel Acker 

Nurse Alex Krajek hangs up his 3M Versaflo TR-300+ powered air purifying respirator after working in a patient room in a wing housing coronavirus disease (COVID-19) patients at UW Health University Hospital in Madison, Wisconsin, U.S. November 18, 2020. REUTERS/Daniel Acker 

Nurse Kate Knepprath dons a 3M Versaflo TR-300+ powered air purifying respirator as she prepares to enter the room of a coronavirus disease (COVID-19) patient being treated at UW Health University Hospital in Madison, Wisconsin, U.S. November 18, 2020. REUTERS/Daniel Acker 

Medical assistant Alex Hutton from London, Britain, wears a powered air purifying respirator (PAPR) hood as he works at a drive-thru COVID-19 testing site operated by University of Utah Health at Rice-Eccles Stadium, as the coronavirus disease (COVID-19) outbreak continues in Salt Lake City, Utah, U.S., November 14, 2020. REUTERS/Bing Guan 

Medical assistant Alex Hutton from London, Britain, wears a powered air purifying respirator (PAPR) hood as he collects a nasal swab sample from a patient at a drive-thru COVID-19 testing site operated by University of Utah Health at Rice-Eccles Stadium, as the coronavirus disease (COVID-19) outbreak continues in Salt Lake City, Utah, U.S., November 14, 2020. REUTERS/Bing Guan 

Medical assistant Alex Hutton from London, Britain, smiles at a patient as he wears a powered air purifying respirator (PAPR) hood at a drive-thru COVID-19 testing site operated by University of Utah Health at Rice-Eccles Stadium, as the coronavirus disease (COVID-19) outbreak continues in Salt Lake City, Utah, U.S., November 14, 2020. REUTERS/Bing Guan 

Paramedics wear respirators while responding to a medical call, amid the outbreak of the coronavirus disease (COVID-19), in downtown Winnipeg, Manitoba, Canada, November 1, 2020. REUTERS/Shannon VanRaes 

Paramedics wear respirators while responding to a medical call, amid the outbreak of the coronavirus disease (COVID-19), in downtown Winnipeg, Manitoba, Canada, November 1, 2020. REUTERS/Shannon VanRaes 

Paramedics wear respirators while responding to a medical call, amid the outbreak of the coronavirus disease (COVID-19), in downtown Winnipeg, Manitoba, Canada, November 1, 2020. REUTERS/Shannon VanRaes 

Paramedics wear respirators while responding to a medical call, amid the outbreak of the coronavirus disease (COVID-19), in downtown Winnipeg, Manitoba, Canada, November 1, 2020. REUTERS/Shannon VanRaes 

A paramedic wearing a respirator pushes a man towards St. Boniface Hospital, which is a reported site of the coronavirus disease (COVID-19) outbreak according to local media, in Winnipeg, Manitoba, Canada, November 1, 2020. REUTERS/Shannon VanRaes 

Healthcare workers wearing powered air purifying respirator (PAPR) hoods process COVID-19 test samples at a drive-thru testing site operated by Avera Health inside the former Silverstar Car Wash, as the coronavirus disease (COVID-19) outbreak continues in Sioux Falls, South Dakota, U.S., October 28, 2020. REUTERS/Bing Guan 

A healthcare worker wearing a powered air purifying respirator (PAPR) hood works at a drive-thru COVID-19 testing site at the Sanford Sports Complex Clinic, as the coronavirus disease (COVID-19) outbreak continues in Sioux Falls, South Dakota, U.S., October 28, 2020. REUTERS/Bing Guan 

Registered nurse (RN) Catherine Klepper, wearing a powered air purifying respirator (PAPR) hood, works at a drive-thru COVID-19 testing site operated by Avera Health inside the former Silverstar Car Wash, as the coronavirus disease (COVID-19) outbreak continues in Sioux Falls, South Dakota, U.S., October 28, 2020. REUTERS/Bing Guan 

Healthcare workers wearing powered air purifying respirator (PAPR) hoods process COVID-19 test samples at a drive-thru testing site operated by Avera Health inside the former Silverstar Car Wash, as the coronavirus disease (COVID-19) outbreak continues in Sioux Falls, South Dakota, U.S., October 28, 2020. REUTERS/Bing Guan 

Healthcare workers wearing powered air purifying respirator (PAPR) hoods process COVID-19 test samples at a drive-thru testing site operated by Avera Health inside the former Silverstar Car Wash, as the coronavirus disease (COVID-19) outbreak continues in Sioux Falls, South Dakota, U.S., October 28, 2020. REUTERS/Bing Guan 

Registered nurse Deb Grabo, wearing a 3M powered air purifying respirator (PAPR) hood, prepares to begin her shift at a drive-thru testing site inside the Bismarck Event Center as the coronavirus disease (COVID-19) outbreak continues in Bismarck, North Dakota, U.S., October 26, 2020. REUTERS/Bing Guan 

Registered nurse Deb Grabo, wearing a 3M powered air purifying respirator (PAPR) hood, prepares to begin her shift at a drive-thru COVID-19 testing site inside the Bismarck Event Center, as the coronavirus disease outbreak continues in Bismarck, North Dakota, U.S., October 26, 2020. REUTERS/Bing Guan 

A medical personnel is pictured wearing a BYD Care N95 particulate respirator mask and a face shield while working at a pop-up testing centre for the coronavirus disease (COVID-19), as the state of New South Wales grapples with an outbreak of new cases, in Sydney, Australia, July 30, 2020. REUTERS/Loren Elliott 

Habtamu Kehali, respiratory therapist gives a training on the mechanical ventilator for health professionals as part of preparations to treat the coronavirus disease (COVID-19) patients at St. Peter's hospital on the outskirts of Addis Ababa, Ethiopia May 2, 2020. Picture taken May 2, 2020. REUTERS/Tiksa Negeri 

Ethiopia's Minister of Health Lia Tadesse is seen inside a medical ward under preparation to treat the coronavirus disease (COVID-19) patients at St. Peter's hospital on the outskirts of Addis Ababa, Ethiopia May 2, 2020. Picture taken May 2, 2020. REUTERS/Tiksa Negeri 

Habtamu Kehali, respiratory therapist gives a training on the mechanical ventilator for health professionals as part of preparations to treat the coronavirus disease (COVID-19) patients at St. Peter's hospital on the outskirts of Addis Ababa, Ethiopia May 2, 2020. Picture taken May 2, 2020. REUTERS/Tiksa Negeri 

Habtamu Kehali, respiratory therapist gives a training on the mechanical ventilator for health professionals as part of preparations to treat the coronavirus disease (COVID-19) patients at St. Peter's hospital on the outskirts of Addis Ababa, Ethiopia May 2, 2020. Picture taken May 2, 2020. REUTERS/Tiksa Negeri 

Habtamu Kehali, respiratory therapist gives a training on the mechanical ventilator for health professionals as part of preparations to treat the coronavirus disease (COVID-19) patients at St. Peter's hospital on the outskirts of Addis Ababa, Ethiopia May 2, 2020. Picture taken May 2, 2020. REUTERS/Tiksa Negeri 

Dr Lukasz Szarpak 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