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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, Jun 16: With an increase of 10,667 cases and 380 deaths in the past 24 hours, the COVID-19 count in India has reached 3,43,091 on Tuesday, according to the Union Health and Family Welfare Ministry.

It is noteworthy that today's spike in cases is lower than the 11,502 registered in the country yesterday and has also stayed below the 11 thousand mark it had been crossing for the past two days in a row.

However, there is an increase in the number of deaths due to the infection from yesterday, with 380 deaths being reported from across the country, the toll due to COVID-19 has now reached 9,900.

The COVID-19 count includes 1,53,178 active cases, while 1,80,013 patients have been cured and discharged or migrated so far.

Maharashtra with 1,10,744 cases continues to be the worst-affected state in the country with 50,567 active cases while 56,049 patients have been cured and discharged in the state so far. The toll due to COVID-19 has crossed the four thousand mark and reached 4,128 in the state.
It is followed by Tamil Nadu with 46,504 and the national capital with 42,829 confirmed cases.

New Delhi, Jan 24: The government's plan to sell national carrier Air India may face political and legal headwinds with senior BJP leader Subramanian Swamy raising the red flag against the decision.

Days before the launch of bidding process by inviting Expressions of Interest (EoI) from potential suitors, Swamy has warned against such move, saying the issue was currently being discussed by a Parliamentary panel.

"Right now, it (Air India disinvestment) is before the consultative committee and I am a member of that. I have been asked to give a note which will be discussed in the next meeting. They can't go ahead without that," Swamy told media.

"If they do, I will go to court. They know that too," he cautioned.

A vocal opponent of Air India privatisation, Swamy had earlier suggested to list 49 per cent of Air India shares on stock exchanges while government holds 51 per cent in the carrier, as an alternative to selling its entire stake to private companies.

It has been reliably learnt that the Rajya Sabha member had expressed reservations over privatisation of Air India at the meeting of a Parliamentary consultative committee earlier this month.

After its failed first attempt, the Modi government has shown great zeal this time to sell Air India. It is set to offer a sweetened deal to potential buyers this time around by removing a large chunk of the debt and liabilities from the airline’s books.

Aviation Minister Hardeep Singh Puri had earlier said that Air India will be shut down, in case the disinvestment exercise is not successful.

Sources told media that the preliminary information memorandum (PIM) inviting EoI has been tentatively scheduled to be unveiled on January 27.

Air India is proposed to be sold along with its subsidiary Air India Express and ground-handling joint venture company Air India Singapore Airport Terminal Services Ltd (AISATS) in which it has 50 per cent stake.

Air India on January 10 came out with a tender for engaging aircraft asset management companies for carrying out technical audit of its entire fleet.

A Ministerial panel on Air India chaired by Home Minister Amit Shah on January 7 approved the draft EoI and a share purchase agreement (SPA) for the airline's disinvestment.