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The India Gate war memorial is pictured in New Delhi, India, on April 8, 2020.ADNAN ABIDI/Reuters

India’s extended lockdown to curb the coronavirus outbreak has shut down schools, workplaces, industries, transport, and forced people to stay home.

It also led to an unexpected bonus in the country with six out of 10 of the world’s most polluted cities: cleaner air.

“It is a hell of a change,” said Kunal Chopra, who suffers from chronic bronchitis and whose morning walks no longer begin with a shot from an inhaler. “The air is much fresher and my breathing problems have gone down.”

In photos: A look at smog levels around the world before and after coronavirus lockdowns

India accounts for the highest pollution-related deaths in the world with more than 2 million people every year, according to a December 2019 report by the Global Alliance of Health and Pollution.

On March 25, the first day of the lockdown, the average PM 2.5 levels decreased by 22 per cent and nitrogen dioxide – which comes from burning fossil fuels – dropped by 15 per cent, according to air pollution data analyzed by the Center for Research on Energy and Clean Air.

“These are extraordinary times,” said Anumita Roychowdhury, executive director at the Center for Science and Environment, a research and advocacy organization in New Delhi. She attributed the drop in air pollutants to less vehicles on the road, construction activity, and factories shutting down.

A composite photo shows a boat on the banks of the river Yamuna on March 21, 2018, and after air pollution level started to drop during a 21-day nationwide lockdown to slow the spreading of the novel coronavirus.ADNAN ABIDI/Reuters

“People are more vulnerable during a pandemic in areas with high pollution,” she said. “Our lungs and hearts are already compromised, and we cannot fight the virus.”

India has reported nearly 20,000 confirmed cases of COVID-19 and over 600 deaths.

The stringent lockdown measures that are set to be lifted on May 3 also have had an effect on India’s rivers.

Pictures of pristine clear waters of the Ganges, India’s longest river considered holy by Hindus, were enthusiastically shared on social media a few weeks into the lockdown. India’s pollution monitoring body said the water had even become fit for bathing in some areas, according to real-time monitors placed along the 2,575-kilometre (1,600-mile) –long river.

A recent analysis by the Delhi Pollution Control Board found that the quality of the Yamuna River flowing along New Delhi has also improved during the lockdown. The report cited a decrease in runoffs from 28 industrial clusters and less trash.

“The lockdown has clearly told us what the main sources of pollution are,” said Vimlendu Jha, an environmentalist and founder of Swechha, a non-governmental organization helping youth fight climate change. “Effluents are forced into our river bodies, and that is major reason why our rivers are black.”

Jha and other experts warn that the environmental improvements may be short-lived as the government eventually lifts the lockdown and rampant economic activity resumes.

“How was a lockdown for just a few weeks able to achieve what governments could not for decades?” said Jha, who believes authorities should study data collected during the lockdown to devise better environmental policies.

Roychowdhury suggested private workplaces that shifted their work online during the lockdown should institutionalize working from home to consider the impact of commuting on air pollution.

But that’s not everyone.

Ashok Mandal, a scrawny rickshaw driver in New Delhi, spends hours scanning the streets for a passenger. He finds none. Used to making at least 400 rupees ($5) every day ferrying passengers in a residential neighbourhood, his income has been slashed to a meagre 70 rupees ($1) for picking up and delivering groceries.

“Clean air means nothing to me,” Mandal said. “I am just trying to make it through each day.”

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