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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.

The Shopping Centres Association of India (SCAI) on Monday said the sector has lost over Rs 90,000 crore in the last two months, owing to the lockdown, and market players need much more than the repo rate cut and the loan moratorium extended by the RBI.

In a statement, the industry body said that the Reserve Bank of India's (RBI) relief measures are not adequate to support the liquidity needs of the industry.

According to the SCAI, there is a common misconception that the shopping centres' industry is centred around metros and large cities with investments only from large developers, private equity players and foreign investors.

"However, the fact is that most malls are part of the SMEs or standalone developers. i.e. more than 550 are single owned by standalone developers out of the 650-odd organised shopping centres across the country and there are 1,000+ small centres in smaller cities," it said.

Amitabh Taneja, Chairman of SCAI said: "The organised retail industry is in distress and has not earned anything since the lockdown and their survival is at stake. While the extension of the loan moratorium talks about some relief on repayment but won't help the industry in liquidity."

He said that a long term beneficial plan from the government is much required to revive the sector.

"Being the most safe, accountable, and controlled environment, unfortunately, malls have not been permitted to open which will lead to job losses and might even shut shops for a lot of mall developers," Taneja said.

In its representations to the Centre and the Reserve Bank of India, the association has also pointed out that, in absence of financial package and stimulus from the RBI, over 500 shopping centres may go bankrupt, that may lead to the banking industry staring at NPAs of Rs 25,000 crore.

The industry body has put forward its recommendations and requests to the government. It had sought moratorium till March 2021 at the least in terms of repayment of bank loans, interest, EMI and so on, without levy of any penalties or penal interest.

It has also sought a one-time loan restructuring with lower rates of interest, permitted for shopping centres and a facilitative and forward-looking support provision of short-term financing options for a period of six to 12 months, at lower interest rates, to meet the increased working capital requirements.

Among other relaxations, it had also appealed for GST rebates to offset the losses on account of and for the period of closure of business.

It also said that interest rates should be brought down to "manageable levels" of 5-6% in view of the precarious financial situation.