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Washington, Apr 23: Air pollution over northern India has plummeted to a 20-year-low for this time of the year, according to satellite data published by US space agency National Aeronautics and Space Administration (NASA).
The US space agency's satellite sensors observed aerosol levels at a 20-year low post the countrywide lockdown, implemented to slow the spread of the novel coronavirus.

"We knew we would see changes in atmospheric composition in many places during the lockdown," said Pawan Gupta, a Universities Space Research Association (USRA) scientist at NASA''s Marshall Space Flight Center. "But I have never seen aerosol values so low in the Indo-Gangetic Plain at this time of year," added Mr Gupta.

Acting Assistant Secretary of State for South and Central Asia Alice G Wells tweeted, "These images from NASA were taken each spring starting in 2016 and show a 20-year low in airborne particle levels over India. When India and the world are ready to work and travel again, let's not forget that collaborative action can result in cleaner air."

The data published with maps show aerosol optical depth (AOD) in 2020 compared to the average for 2016-2019. Aerosol optical depth is a measure of how light is absorbed or reflected by airborne particles as it travels through the atmosphere.

If aerosols are concentrated near the surface, an optical depth of 1 or above indicates very hazy conditions. An optical depth, or thickness, of less than 0.1 over the entire atmospheric vertical column is considered "clean." The data were retrieved by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite.

In the first few days of the lockdown, it was difficult to observe a change in the pollution signature. "We saw an aerosol decrease in the first week of the shutdown, but that was due to a combination of rain and the lockdown," said Mr Gupta.

Around March 27, heavy rain poured over vast areas of northern India and helped clear the air of aerosols. Aerosol concentrations usually increase again after such heavy precipitation.

"After the rainfall, I was really impressed that aerosol levels did not go up and return to normal. We saw a gradual decrease and things have been staying at the level we might expect without anthropogenic emissions," Mr Gupta said.

On March 25, the Indian government placed its 1.3 billion citizens under a strict lockdown to reduce the spread of COVID-19. The countrywide mandate decreased activity at factories and severely reduced car, bus, truck and airplane traffic. Every year, aerosols from anthropogenic (human-made) sources contribute to unhealthy levels of air pollution in many Indian cities.

Aerosols are tiny solid and liquid particles suspended in the air that reduce visibility and can damage the human lungs and heart.

In southern India though, the story is a little hazier. Satellite data show aerosol levels have not yet decreased to the same extent. In fact, levels seem to be slightly higher than in the past four years. The reasons are unclear but could be related to recent weather patterns, agricultural fires, winds or other factors.

"This a model scientific experiment," Robert Levy, program leader for NASA's MODIS aerosol products, said about the lockdown and its effects on pollution.

"We have a unique opportunity to learn how the atmosphere reacts to sharp and sudden reductions in emissions from certain sectors. This can help us separate how natural and human sources of aerosols affect the atmosphere," Mr Levy added.

May 19: Congress general secretary Priyanka Gandhi Vadra's office on Tuesday said the Uttar Pradesh government has demanded that the 1,000 buses the party wants to ply for ferrying migrant labourers back to the state be handed over in Lucknow this morning and alleged that the move is politically motivated.

It also alleged that the demand shows that the UP government lacks the intention to help those stranded at the state's borders.

The Uttar Pradesh government on Monday had accepted the Congress' offer to run 1,000 buses to bring migrant labourers back to the state, a proposal which had triggered a war of words between the two sides.

In a letter to Additional Chief Secretary Avneesh Kumar Awasthi, Priyanka Gandhi's private secretary Sandeep Singh said a letter was received from the UP official at 11.40 am via email, in which it has been stated that 1,000 buses with all documents be handed over at Lucknow by 10 am on Tuesday.

"In a situation when thousands of workers are walking on the streets and thousands of people have gathered at the UP borders at various registration centres, sending 1,000 empty buses to Lucknow is not only a waste of time and resources but is also inhuman and the product of an anti-poor mindset," Singh said in the letter in Hindi.

"This demand of your government seems politically motivated. It does not seem that your government wants to help our labourer brothers and sisters who are facing a disaster," the letter said.

The state government had asked Priyanka Gandhi, who had made the offer, to provide it with a list of buses along with the names of their drivers and conductors.

Subsequently, her private secretary Singh had given details of the buses and its drivers to the UP government in an email.

"All details of the 1,000 buses are attached with this e-mail. Out of them, a few drivers will be reverified and those details will also be mailed to you in a few hours. I hope you will give permission for those buses to ply as soon as possible," Singh had said in the communication to the UP government on Monday.

The Congress leader had recently written to Uttar Pradesh Chief Minister Yogi Adityanath, seeking permission to run 1,000 buses at her party's expense.

The party had then accused the BJP-run UP government of ignoring the offer.

"The offer made to the chief minister through the letter on May 16 in connection with migrant labourers has been accepted," Additional Chief Secretary Awasthi (Home and Information) had said in a letter to Priyanka Gandhi's private secretary.

A little later on Twitter, Priyanka Gandhi, who is the Congress general secretary in charge of eastern Uttar Pradesh, had thanked Adityanath.

"Thank you for allowing us to run 1,000 buses at the expense of the Congress to help thousands of brothers and sisters walking on the roads in Uttar Pradesh," she had tweeted in Hindi.

She had said the Congress will stand with these people during the difficult time they face.

In a television interview earlier on Monday, Adityanath accused the Congress of playing politics over the plight of migrant workers.

Singh in his letter on Tuesday also expressed surprise at the chief minister, saying his government was demanding the details of buses since the last three days and asserted that the details were provided immediately after the letter from the UP government was received in this regard.