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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 10: Congress leader Rahul Gandhi on Saturday demanded that Prime Minister Narendra Modi ensured audit of donations made to the PM-CARES Fund, and to share the details and the money spent with the people.

"The PM-CARES Fund has received huge contributions from PSUs and major public utilities like the Railways. It's important that the Prime Minister ensure the fund is audited and that the record of money received and spent is available to the public," he tweeted.

The #PmCares fund has received huge contributions from PSUs & major public utilities like the Railways.

It’s important that PM ensures the fund is audited & that the record of money received and spent is available to the public.

— Rahul Gandhi (@RahulGandhi) May 9, 2020
His remarks came amid reports that the central government is accumulating a huge sum of money in the Prime Minister's Citizen Assistance and Relief in Emergency Situations Fund set up as a corpus to fight novel coronavirus and that the amount spent will not be audited by the Comptroller and Auditor General.

The CAG office had clarified that since the fund is based on donations, it has no right to audit a charitable organisation.

On Friday, Rahul Gandhi told the media that the PM-CARES Fund should be audited and people of the country should know about the donors and the donations made.

New Delhi, May 13: Prime Minister Narendra on Tuesday announced Rs 20 lakh crore special economic package for the country to be 'self-reliant' and deal with COVID-19.

"I announce a special economic package today. This will play an important role in the 'Atmanirbhar Bharat Abhiyan.' The announcements made by the government over COVID, decisions of RBI and today's package totals to Rs 20 lakh crore. This is 10 per cent of India's GDP," said Prime Minister Modi in his address to the nation. The Prime Minister said that humanity would not accept defeat from the coronavirus but the people have to stay safe and move forward.

"We had never seen or heard about such a crisis ever before. This is definitely unimaginable for mankind. It is unprecedented. But humanity will not accept defeat from this virus. We have to not only protect ourselves but also move forward," he said.

Talking about the gravity of the virus, Modi said: "It has been four months the world is fighting COVID-19. More than 42 lakh people from different countries have been infected by COVID-19. More than 2.75 lakh people have lost their lives due to the virus. In India too many families have lost their dear ones, I express my condolences to them."

"Today when the entire world is in crisis, we will have to further firm our resolve," he added.

The Prime Minister on Monday held a video conference meeting with Chief Ministers of all states to discuss the road ahead in India's fight against COVID-19 and noted that he was of the firm view that measures needed during the third phase of lockdown will not be needed in the fourth phase.

Prime Minister Modi had said the need was to reduce the transmission rate of the disease and to increase public activity gradually while adhering to all the guidelines and efforts to be made towards achieving both these objectives.

The phase three of the lockdown is coming to an end on May 17.