A metro train moves over a bridge built over the Yamuna river on a smoggy morning in New Delhi, India November 3, 2022. REUTERS/Adnan Abidi 

A labourer sits on top of an under-construction building on a smoggy morning in New Delhi, India November 2, 2022. REUTERS/Adnan Abidi 

A metro train moves over a bridge built over the Yamuna river on a smoggy morning in the old quarters of Delhi, India November 2, 2022. REUTERS/Adnan Abidi 

A couple poses during a pre-wedding photo on the banks of Yamuna river on a smoggy morning in the old quarters of Delhi, India November 2, 2022. REUTERS/Adnan Abidi 

A person crosses the street on a smoggy morning in Jakarta, Indonesia, May 27, 2022. REUTERS/Willy Kurniawan 

Birds fly on a smoggy morning in Jakarta, Indonesia, May 27, 2022. REUTERS/Willy Kurniawan TPX IMAGES OF THE DAY 

Birds fly on a smoggy morning in Jakarta, Indonesia, May 27, 2022. REUTERS/Willy Kurniawan 

People walk past boards with images of Shuey Rhon Rhon, the 2022 Beijing Winter Paralympic Games Mascot, on a shopping street on a smoggy day in Beijing, China, January 24, 2022. REUTERS/Tingshu Wang 

Residential buildings are seen at the Beijing’s Central Business District (CBD) on a smoggy day in Beijing, China, January 24, 2022. REUTERS/Tingshu Wang 

People walk at a shopping street on a smoggy day in Beijing, China, January 24, 2022. REUTERS/Tingshu Wang 

Vehicles are seen on a highway on a smoggy morning in New Delhi, India, December 2, 2021. REUTERS/Anushree Fadnavis 

Vehicles are seen on a highway on a smoggy morning in New Delhi, India, December 2, 2021. REUTERS/Anushree Fadnavis 

School girls and mules are seen crossing railway tracks on a smoggy morning in New Delhi, India, December 2, 2021. REUTERS/Anushree Fadnavis 

A man rides a boy on a bicycle to school as they reopened after remaining closed for nearly 15 days due to a spike in air pollution, on a smoggy morning in New Delhi, India, November 29, 2021. REUTERS/Anushree Fadnavis 

School girls walk towards a school as they reopened after remaining closed for nearly 15 days due to a spike in air pollution, on a smoggy morning in New Delhi, India, November 29, 2021. REUTERS/Anushree Fadnavis REFILE - QUALITY REPEAT 

School girls walk towards a school as they reopened after remaining closed for nearly 15 days due to a spike in air pollution, on a smoggy morning in New Delhi, India, November 29, 2021. REUTERS/Anushree Fadnavis 

A man rides a girl on a bicycle to school as they reopened after remaining closed for nearly 15 days due to a spike in air pollution, on a smoggy morning in New Delhi, India, November 29, 2021. REUTERS/Anushree Fadnavis 

A man stands on the banks of the Yamuna river on a smoggy morning in New Delhi, India, November 19, 2021. REUTERS/Anushree Fadnavis 

People ride on boats on the Yamuna river on a smoggy morning in New Delhi, India, November 19, 2021. REUTERS/Anushree Fadnavis 

A man sits on the banks of the Yamuna river on a smoggy morning in New Delhi, India, November 19, 2021. REUTERS/Anushree Fadnavis 

A man adjusts a string tied to a tree on the banks of the Yamuna river on a smoggy morning in New Delhi, India, November 19, 2021. REUTERS/Anushree Fadnavis 

A man holds a newspaper on the banks of the Yamuna river on a smoggy morning in New Delhi, India, November 19, 2021. REUTERS/Anushree Fadnavis 

People sit under a tree on the banks of the Yamuna river on a smoggy morning in New Delhi, India, November 19, 2021. REUTERS/Anushree Fadnavis 

A Sadhu or a Hindu holy man walks across a highway on a smoggy morning in New Delhi, India, November 18, 2021. REUTERS/Anushree Fadnavis 

A Sadhu or a Hindu holy man adjusts a cloth on his face as he walks across a highway on a smoggy morning in New Delhi, India, November 18, 2021. REUTERS/Anushree Fadnavis 

A woman walks across a field near the Yamuna river on a smoggy morning in New Delhi, India, November 18, 2021. REUTERS/Anushree Fadnavis 

People feed seagulls from a boat at Yamuna river, on a smoggy morning in New Delhi, India November 18, 2021. REUTERS/Navesh Chitrakar TPX IMAGES OF THE DAY 

A boy rows a boat as seagulls fly over the waters of the river Yamuna river, on a smoggy morning in New Delhi, India November 18, 2021. REUTERS/Navesh Chitrakar 

People ride a boat across Yamuna river, on a smoggy morning in New Delhi, India November 18, 2021. REUTERS/Navesh Chitrakar 

People ride a boat across Yamuna river, on a smoggy morning in New Delhi, India November 18, 2021. REUTERS/Navesh Chitrakar 

People play cricket on the floodplains of the Yamuna river on a smoggy morning in New Delhi, India, November 17, 2021. REUTERS/Anushree Fadnavis 

A motorbike rides on the floodplains of the Yamuna river on a smoggy morning in New Delhi, India, November 17, 2021. REUTERS/Anushree Fadnavis 

People are seen on the floodplains of the Yamuna river on a smoggy morning in New Delhi, India, November 17, 2021. REUTERS/Anushree Fadnavis 

People play cricket on the floodplains of the Yamuna river on a smoggy morning in New Delhi, India, November 17, 2021. REUTERS/Anushree Fadnavis 

People are seen on the floodplains of the Yamuna river on a smoggy morning in New Delhi, India, November 17, 2021. REUTERS/Anushree Fadnavis 

A boy plays cricket on the floodplains of the Yamuna river on a smoggy morning in New Delhi, India, November 17, 2021. REUTERS/Anushree Fadnavis 

A man sweeps inside a bus depot on a smoggy morning in New Delhi, India, November 16, 2021. REUTERS/Anushree Fadnavis 

People exercise on a smoggy morning at Lodhi Garden in New Delhi, India, November 16, 2021. REUTERS/Anushree Fadnavis 

People walk on a smoggy morning at Lodhi Garden in New Delhi, India, November 16, 2021. REUTERS/Anushree Fadnavis 

A worker is seen next to an anti-smog gun near the ongoing redevelopment project on Rajpath, on a smoggy day in New Delhi, India, November 12, 2021. REUTERS/Anushree Fadnavis 

A view of Rajpath is seen on a smoggy day in New Delhi, India, November 12, 2021. REUTERS/Anushree Fadnavis 

A woman crosses railway tracks as a goods train passes by, on a smoggy day in New Delhi, India, November 12, 2021. REUTERS/Anushree Fadnavis 

A metro train passes through the Rajiv Gandhi Cancer Institute and Research Center as it approaches Rithala metro station on a smoggy morning in Delhi, India November 12, 2021. REUTERS/Navesh Chitrakar 

Hindu devotees light fireworks on the banks of polluted Yamuna river on a smoggy morning, during the Hindu religious festival of Chhath Puja, in New Delhi, India November 11, 2021. REUTERS/Anushree Fadnavis 

Hindu devotees light fireworks on the banks of polluted Yamuna river on a smoggy morning during the Hindu religious festival of Chhath Puja in New Delhi, India, November 11, 2021. REUTERS/Anushree Fadnavis 

A woman prays on the banks of the polluted river Yamuna on a smoggy morning in New Delhi, November 8, 2021. REUTERS/Anushree Fadnavis Pulitzer Prize finalist for Feature Photography 

A woman brushes her teeth as she stands amidst the foam covering the polluted Yamuna river on a smoggy morning in New Delhi, India November 8, 2021. REUTERS/Anushree Fadnavis 

People bathe amidst the foam covering the polluted Yamuna river on a smoggy morning in New Delhi, India November 8, 2021. REUTERS/Anushree Fadnavis 

Women pray as they stand amidst the foam covering the polluted Yamuna river on a smoggy morning in New Delhi, India November 8, 2021. REUTERS/Anushree Fadnavis 

People bathe amidst the foam covering the polluted Yamuna river on a smoggy morning in New Delhi, India November 8, 2021. REUTERS/Anushree Fadnavis 

A woman prays on the banks of the river Yamuna on a smoggy morning in New Delhi, November 8, 2021. REUTERS/Anushree Fadnavis TPX IMAGES OF THE DAY 

Women bathe themselves in the polluted waters of the river Yamuna on a smoggy morning in New Delhi, November 8, 2021. REUTERS/Anushree Fadnavis 

A child fills a bottle with water while bathing in the polluted waters of the river Yamuna on a smoggy morning in New Delhi, November 8, 2021. REUTERS/Anushree Fadnavis 

A couple feeds seagulls as they stand on the banks of Yamuna river, on a smoggy morning in New Delhi, India November 4, 2021. REUTERS/Adnan Abidi 

People ride a boat across Yamuna river on a smoggy morning in New Delhi, India, November 4, 2021. REUTERS/Adnan Abidi 

A couple gets their picture clicked as they stand in a boat in the Yamuna river on a smoggy morning in New Delhi, India, November 4, 2021. REUTERS/Adnan Abidi 

Traffic moves on a flyover on a smoggy morning in New Delhi, India, November 4, 2021. REUTERS/Adnan Abidi TPX IMAGES OF THE DAY 

People ride a boat across Yamuna river on a smoggy morning in New Delhi, India, November 4, 2021. REUTERS/Adnan Abidi 

A man bathes in the Yamuna river on a smoggy morning in New Delhi, India, November 4, 2021. REUTERS/Adnan Abidi 

A man walks along a pedestrian bridge as the sun rises behind him during a smoggy morning amidst the ongoing air pollution in Kathmandu, Nepal April 7, 2021. REUTERS/Navesh Chitrakar