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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.

New Delhi, May 27: Professor Johan Giesecke of the Karolinska Institute, Sweden, on Wednesday claimed that India will ruin its economy very quickly if it had a severe lockdown.

Claiming that a strict lockdown may disrupt India's economic growth, Giesecke during an interaction with Congress leader Rahul Gandhi said: "In India, you will do more harm than good with strict lockdown measures. India will ruin its economy very quickly if it had a severe lockdown."

While calling for a soft lockdown approach in India, he suggested that India has to ease restrictions one by one. It may, however, take months to completely come out of lockdown, he said.

He further criticised countries across the globe for having no post-lockdown strategy.

Emphasising on the disease, the Swedish health expert said that coronavirus is spreading like a wildfire across the world. "It is a very mild disease. Ninety-nine per cent infected people will have very less or no symptoms," he added.

Meanwhile, Ashish Jha, Director Harvard Global Health Institute and a recognised public health official, in interaction with Gandhi, called for a need to go in for an 'aggressive' COVID-19 testing to create confidence among people.

"When the economy is opened post-lockdown, you have to create confidence. There is a need for aggressive testing strategy in high-risk areas," he said.

He asserted that COVID-19 is not the last pandemic in the world, adding that "We are entering the age of large pandemics".

Jha further said that countries like South Korea, Taiwan and Hong Kong have responded the best to COVID-19 pandemic, while Italy, Spain, the US and the UK have responded the worst.

A few days ago, the Gandhi scion had interacted with former Reserve Bank of India Governor Raghuram Rajan and Nobel Prize Winner Abhijit Banerjee to discuss various issues related to the COVID-19 crisis.