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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.

Hyderabad, May 19: Telangana Chief Minister K Chandrashekar Rao has hit out at the Narendra Modi-led NDA government over the fiscal stimulus package, accusing it of treating states like "beggars" and imposing "laughable" conditions for increasing borrowing limits under the FRBM Act.

"This is 'pure cheating. Betrayal. Jugglery of numbers. All gas. The Centre has reduced its own prestige," he said while referring to conditions linked to the increased borrowing limits for states under the Fiscal Responsibility and Budget Management (FRBM) Act.

Rao cited international journals that had commented on whether the Union Finance Minister's aim was to revive the GDP or to reach the Rs 20 lakh crore number (the stimulus package announced by Prime Minister Narendra Modi).

"This is a very cruel package. It is fully in a feudal policy and dictatorial attitude. We fully condemn this. This is not what we asked for," Rao, who had supported several measures taken by the Centre so far in the fight against coronavirus, said.

At a time when the finances of states were paralysed due to COVID-19 global pandemic, the state governments wanted funds to reach them so that they can help people in different forms, he said. "When we asked for it, you treat states like beggars, what did the Centre do? Is this the way reforms are implemented in India?" he asked during an interaction with media on Monday after a cabinet meeting.

For example, two per cent increase under the Fiscal Responsibility and Budget Management (FRBM) Act (about Rs 20,000 crore in Telangana) has been given.

But, the conditions put are "laughable" and "very nasty" though the loan was to be fully repaid by the state, he said.

Explaining the situation, Rao said Rs 2,500 crore would be given if reforms were implemented in power sector and Rs 2,500 crore would be allowed if reforms in market committees as suggested by the central government are accepted.

"Is this a package? What is this? This cannot be called a package. Very sorry.. This is not the policy to be followed in a federal system... Then what are the state governments for?" the Telangana Rashtra Samithi supremo asked and said they were also constitutional governments and not subordinates.

The CM said he felt anguished and the way the Centre was wielding control over states was against the spirit of federalism.

"Prime Minister ji said cooperative federalism. This has proved that it is totally hollow and bogus," he added.

The state, however, has already fulfilled certain conditions, he added.

On the occasion, Rao also outlined his government's certain policy guidelines for regulatory farming proposed to be implemented.

On the additional water proposed to be drawn by the neighbouring Andhra Pradesh from Srisailam project, he said there was no question of compromising on the states interests.

Flaying Opposition criticism against his government for allegedly failing to protect the state's interests, Rao said he had sought peaceful co-existence with all the neighbouring states.