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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.

Kolkata, Jun 29: Sweet-loving Bengalis have something to cheer about in COVID-19 time as the West Bengal government decided to come out with a "sandesh" which will contain honey from Sundarbans and increase immunity, an official said on Sunday.

Cotton cheese made from cow milk will be mixed with pure honey from the Sunderbans to prepare the "Arogya Sandesh" which will also have extracts of tulsi leaves, an official of the Animal Resources Development Department said.

No artificial flavours would be added to the sweetmeat which will be available in the department's outlets in the city and neighbouring districts, he said.

The sandesh will boost the immune system as a whole but it is not a COVID-19 antidote, the official said.

Sunderbans Affairs Minister Manturam Pakhira said the honey for making Arogya Sandesh will be collected from beehives in places such as Pirkhali, Jharkhali and other parts of the Sunderbans and it will be stored in a scientific manner.

The sandesh is expected to hit the shelves in another two months and the pricing will be within the reach of the common man, the animal resources development department official said.

Earlier this month, a reputed sweetmeat chain of Kolkata came out with an "Immunity Sandesh" claiming that it contains various herbs and spices such as haldi (turmeric), tulsi, saffron, and cardamom and Himalayan honey, which will boost immunity to fight novel coronavirus.

New Delhi, Mar 3: Delhi's Tihar Prison authorities had made all necessary preparations for the hanging of four convicts in the Nirbhaya gangrape-and-murder case which was scheduled for Tuesday, officials said Monday.

However, on Monday evening, a city court deferred the hanging till further orders.

Postponing the execution, Additional Sessions Judge Dharmender Rana said the hanging cannot be carried out pending disposal of Pawan Gupta's mercy plea before the President, observing any condemned convict must not meet his "Creator" with grievance against courts for not acting fairly on the opportunity to exhaust legal remedies.

"We had made all the necessary arrangements for the execution of the four convicts which was scheduled for Tuesday at 6 AM. Now, the execution has been postponed and we are waiting for the further order by the court," a senior jail official said.

The hanging of the four men -- Mukesh Kumar Singh (32), Vinay Kumar Sharma (26), Akshay Kumar Singh (31) and Pawan -- who are lodged in Tihar jail, was fixed for March 3 in Tihar jail on a court order.

"We had checked the ropes. Hangman was called and dummy executions were carried out," another senior jail official said.

Barring Pawan, the other three had in the previous weeks moved curative petitions and mercy pleas which were all dismissed.

The first date of execution -- January 22 -- fixed on January 7 was postponed by the court to February 1. But on January 31, the court indefinitely postponed the hanging. On February 17, the court again issued fresh date for execution of death warrants for March 3 at 6 AM.

The court in its orders observed that the four convicts cannot be hanged since a mercy plea of one or the other convict was pending.