Visitors swim at the underwater archaeological park of the ancient port of Amathus in Limassol, Cyprus, July 9, 2022. REUTERS/Yiannis Kourtoglou 

A man uses an oxygen mask at a hospital during a sandstorm in Baghdad, Iraq, May 16, 2022. REUTERS/Ahmed Saad 

A man uses an oxygen mask at a hospital during a sandstorm in Baghdad, Iraq, May 5, 2022. REUTERS/Alaa Al-Marjani 

A man uses an oxygen mask at a hospital during a sandstorm in Baghdad, Iraq, May 5, 2022. REUTERS/Alaa Al-Marjani 

A man uses an oxygen mask at a hospital during a sandstorm in Baghdad, Iraq, April 12, 2022. REUTERS/Ahmed Saad 

A man uses an oxygen mask at a hospital during a sandstorm in Baghdad, Iraq, April 12, 2022. REUTERS/Ahmed Saad 

A man uses an oxygen mask at a hospital during a sandstorm in Baghdad, Iraq, April 12, 2022. REUTERS/Ahmed Saad 

A woman who was struggling to breathe and suffering from possible coronavirus disease (COVID-19) symptoms breathes through an oxygen mask before being transported to the hospital in Shawnee, Oklahoma, U.S. September 8, 2021. REUTERS/Nick Oxford 

A Shawnee Firefighter gives an oxygen mask to a woman who was struggling to breathe and suffering from possible coronavirus disease (COVID-19) symptoms in Shawnee, Oklahoma, U.S. September 8, 2021. REUTERS/Nick Oxford 

A patient who is suffering from the coronavirus disease (COVID-19) wears an oxygen mask in the infectious diseases department of Dalal Jamm hospital as Senegal records more COVID-19 deaths, Dakar, Senegal August 5, 2021. Picture taken August 5, 2021. REUTERS/Zohra Bensemra 

An employee wearing a protective mask delivers oxygen cylinders from a store to a field hospital, to help coronavirus disease (COVID-19) patients, as demand for oxygen continues to grow amid the COVID-19 pandemic, in Bangkok, Thailand, July 17, 2021. REUTERS/Chalinee Thirasupa 

An employee wearing a protective mask delivers oxygen cylinders from a store to a field hospital, to help coronavirus disease (COVID-19) patients, as demand for oxygen continues to grow amid the COVID-19 pandemic, in Bangkok, Thailand, July 17, 2021. REUTERS/Chalinee Thirasupa 

An employee wearing a protective mask delivers oxygen cylinders from a store to a field hospital, to help coronavirus disease (COVID-19) patients, as demand for oxygen continues to grow amid the COVID-19 pandemic, in Bangkok, Thailand, July 17, 2021. REUTERS/Chalinee Thirasupa 

A volunteer adjusts the oxygen mask of a coronavirus (COVID-19) patient in the town of Kale, Sagaing Region, Myanmar, July 5, 2021. Picture taken July 5, 2021. REUTERS/Stringer 

People wearing protective face masks stand with their oxygen cylinders outside a factory to get them refilled amid a surge of the coronavirus disease (COVID-19) cases in Jakarta, Indonesia, July 12, 2021. REUTERS/Ajeng Dinar Ulfiana 

People wearing protective face masks stand with their oxygen cylinders outside a factory to get them refilled amid a surge of the coronavirus disease (COVID-19) cases in Jakarta, Indonesia, July 12, 2021. REUTERS/Ajeng Dinar Ulfiana 

People wearing protective face masks stand with their oxygen cylinders outside a factory to get them refilled amid a surge of the coronavirus disease (COVID-19) cases in Jakarta, Indonesia, July 12, 2021. REUTERS/Ajeng Dinar Ulfiana 

People wearing protective face masks stand with their oxygen cylinders outside a factory to get them refilled amid a surge of the coronavirus disease (COVID-19) cases in Jakarta, Indonesia, July 12, 2021. REUTERS/Ajeng Dinar Ulfiana 

People wearing protective face masks stand with their oxygen cylinders outside a factory to get them refilled amid a surge of the coronavirus disease (COVID-19) cases in Jakarta, Indonesia, July 12, 2021. REUTERS/Ajeng Dinar Ulfiana 

Employees wearing protective masks and scarves lift oxygen cylinders on a pick-up truck at a factory as Indonesia experiences an oxygen supply shortage amid a surge of coronavirus disease (COVID-19) cases, in Jakarta, Indonesia, July 6, 2021. REUTERS/Ajeng Dinar Ulfiana 

Employees wearing protective masks and scarves lift oxygen cylinders on a pick-up truck at a factory as Indonesia experiences an oxygen supply shortage amid a surge of coronavirus disease (COVID-19) cases, in Jakarta, Indonesia, July 6, 2021. REUTERS/Ajeng Dinar Ulfiana 

A man wearing a protective mask sits near oxygen cylinders to be refilled at a factory as Indonesia experiences an oxygen supply shortage amid a surge of coronavirus disease (COVID-19) cases, in Jakarta, Indonesia, July 6, 2021. REUTERS/Ajeng Dinar Ulfiana 

Employees wearing protective masks and scarves lift oxygen cylinders on a pick-up truck at a factory as Indonesia experiences an oxygen supply shortage amid a surge of coronavirus disease (COVID-19) cases, in Jakarta, Indonesia, July 6, 2021. REUTERS/Ajeng Dinar Ulfiana 

An employee wearing a protective mask carries an oxygen cylinder at a factory, as Indonesia experiences an oxygen supply shortage amid a surge of coronavirus disease (COVID-19) cases, in Jakarta, Indonesia, July 6, 2021. REUTERS/Ajeng Dinar Ulfiana 

A man wearing a protective mask queues to refill oxygen tanks as Indonesia experiences an oxygen supply shortage amid a surge of coronavirus disease (COVID-19) cases, at a filling station in Jakarta, Indonesia, July 5, 2021. REUTERS/Willy Kurniawan 

People wearing protective masks queue to refill oxygen tanks as Indonesia experiences an oxygen supply shortage amid a surge of coronavirus disease (COVID-19) cases, at a filling station in Jakarta, Indonesia, July 5, 2021. REUTERS/Willy Kurniawan 

A man wearing a protective mask queues to refill oxygen tanks as Indonesia experiences an oxygen supply shortage amid a surge of coronavirus disease (COVID-19) cases, at a filling station in Jakarta, Indonesia, July 5, 2021. REUTERS/Willy Kurniawan 

People wearing protective masks queue to refill oxygen tanks as Indonesia experiences an oxygen supply shortage amid a surge of coronavirus disease (COVID-19) cases, in Jakarta, Indonesia, July 5, 2021. REUTERS/Willy Kurniawan 

An employee wearing a protective mask on his chin refills an oxygen cylinder at a store amid the coronavirus disease (COVID-19) outbreak in Jakarta, Indonesia, June 29, 2021. REUTERS/Ajeng Dinar Ulfiana 

An employee wearing protective mask lifts an oxygen cylinder to put it on the pick-up truck at a store amid the coronavirus disease (COVID-19) outbreak in Jakarta, Indonesia, June 29, 2021. REUTERS/Ajeng Dinar Ulfiana 

Employees, some of them wearing protective masks, lift oxygen cylinders on the pick-up truck at a factory amid the coronavirus disease (COVID-19) outbreak in Jakarta, Indonesia, June 29, 2021. REUTERS/Ajeng Dinar Ulfiana 

People wearing protective face masks stand with their oxygen cylinders outside a store to get them refilled, amid the coronavirus disease (COVID-19) outbreak in Jakarta, Indonesia, June 28, 2021. REUTERS/Ajeng Dinar Ulfiana 

A man wearing a protective face mask sits near oxygen cylinders outside a store to get them refilled, amid the coronavirus disease (COVID-19) outbreak in Jakarta, Indonesia, June 28, 2021. REUTERS/Ajeng Dinar Ulfiana 

A man wearing a protective face mask waits as workers refill customers' oxygen cylinders outside a store, amid the coronavirus disease (COVID-19) outbreak in Jakarta, Indonesia, June 28, 2021. REUTERS/Ajeng Dinar Ulfiana 

A man wearing a protective face mask sits next to oxygen cylinders outside an oxygen shop to get them refilled, amid the coronavirus disease (COVID-19) outbreak, in Jakarta, Indonesia, June 25, 2021. REUTERS/Ajeng Dinar Ulfiana 

People wearing protective face masks stand with their oxygen cylinders outside an oxygen shop to get them refilled, amid the coronavirus disease (COVID-19) outbreak, in Jakarta, Indonesia, June 25, 2021. REUTERS/Ajeng Dinar Ulfiana 

A man wearing a protective face mask refills an oxygen cylinder, amid the coronavirus disease (COVID-19) outbreak, in Jakarta, Indonesia, June 25, 2021. REUTERS/Ajeng Dinar Ulfiana 

Lilaben Gautambhai Modi, 80, wearing an oxygen mask, sits inside an ambulance as she waits to enter a COVID-19 hospital for treatment, amidst the spread of the coronavirus disease (COVID-19), in Ahmedabad, India, May 5, 2021. REUTERS/Amit Dave 

Ankita Patel, a 31-year-old paramedic, adjusts the oxygen mask of a woman inside an ambulance waiting to enter a coronavirus disease (COVID-19) hospital for treatment, amidst the spread of COVID-19 in Ahmedabad, India, April 29, 2021. Picture taken April 29, 2021. REUTERS/Amit Dave 

Madhuriben S Parmar reacts with an oxygen mask on as she speaks to her family on a video call while lying in an ambulance waiting to enter a COVID-19 hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 28, 2021. REUTERS/Amit Dave 

The husband of Nanduba Chavda adjusts his wife's oxygen mask as they wait in a car to enter a COVID-19 hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 28, 2021. REUTERS/Amit Dave 

Aminbanu Memon wearing an oxygen mask sits in an autorickshaw waiting to enter a COVID-19 hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 28, 2021. REUTERS/Amit Dave 

A patient wearing an oxygen mask is wheeled inside a COVID-19 hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 26, 2021. REUTERS/Amit Dave 

A patient wearing an oxygen mask is seen through the window as she lies on a bed of a COVID ward as the major second wave of the coronavirus disease (COVID-19) surges in Kathmandu, Nepal April 26, 2021. REUTERS/Navesh Chitrakar 

A patient wearing an oxygen mask is seen inside a car waiting to enter a COVID-19 hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 26, 2021. REUTERS/Amit Dave 

A patient wearing an oxygen mask is wheeled inside a COVID-19 hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 26, 2021. REUTERS/Amit Dave 

A patient wearing an oxygen mask looks on as his wife holds a battery-operated fan while waiting inside an auto-rickshaw to enter a COVID-19 hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 25, 2021. REUTERS/Amit Dave 

A patient wearing an oxygen mask sits inside an ambulance waiting to enter a COVID-19 hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 25, 2021. REUTERS/Amit Dave 

A patient wearing an oxygen mask is seen inside an ambulance waiting to enter a COVID-19 hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 25, 2021. REUTERS/Amit Dave 

A patient, wearing an oxygen mask, sits outside Lok Nayak Jai Prakash Narayan Hospital (LNJP), one of India's largest facilities for coronavirus disease (COVID-19) patients only, in New Delhi, India, April 22, 2021. REUTERS/Adnan Abidi TPX IMAGES OF THE DAY 

A patient wearing an oxygen mask waits inside an auto rickshaw to enter a COVID-19 hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 21, 2021. REUTERS/Amit Dave 

Patients wearing oxygen face masks are shifted to a hospital, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 21, 2021. REUTERS/Amit Dave 

A patient wearing an oxygen mask is wheeled inside a COVID-19 hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 21, 2021. REUTERS/Amit Dave 

A patient wears an oxygen mask inside an ambulance waiting to enter a COVID-19 hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 21, 2021. REUTERS/Amit Dave 

A patient wearing an oxygen mask sits on a bed as he is being shifted to a hospital for treatment, amidst the spread of the coronavirus disease (COVID-19) in Ahmedabad, India, April 15, 2021. REUTERS/Amit Dave 

A paramedic adjusts an oxygen mask on a patient with breathing problems inside an ambulance waiting in a queue to enter a COVID-19 hospital, amidst the coronavirus disease pandemic, Ahmedabad, India, April 14, 2021. REUTERS/Amit Dave 

A patient with a breathing problem wears an oxygen mask as she lies inside an ambulance waiting in a queue to enter a COVID-19 hospital, amidst the coronavirus disease pandemic, Ahmedabad, India, April 14, 2021. REUTERS/Amit Dave 

A patient with breathing problems wears an oxygen mask as she waits inside an ambulance in a queue to enter a COVID-19 hospital, amidst the coronavirus disease pandemic, Ahmedabad, India, April 14, 2021. REUTERS/Amit Dave 

A patient with breathing problems wears an oxygen mask as he waits inside an ambulance in a queue to enter a COVID-19 hospital, amidst the coronavirus disease pandemic, Ahmedabad, India, April 14, 2021. REUTERS/Amit Dave 

Patients with breathing problems wear oxygen masks as they wait inside an ambulance in a queue to enter a COVID-19 hospital, amidst the coronavirus disease pandemic, Ahmedabad, India, April 14, 2021. REUTERS/Amit Dave