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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 2: Prime Minister Narendra Modi on Tuesday said India will definitely get its economic growth back as the government continues to pursue various reforms.

Speaking at industry association CII's annual session, he said the government has taken tough steps to fight the coronavirus pandemic and has also taken care of the economy.

"On the one hand we have to safe lives of our people and on the other hand we have to stabilise the economy and speed up the economy," he said.

He said he gets the confidence from farmers, small businesses and entrepreneurs for getting the economic growth back.

"Corona may have slowed our speed (of growth) but India has now moved ahead from lockdown with the phase one of unlock. Unlock Phase-1 has reopened a large part of the economy," he said.

He said intent, inclusion, investment, infrastructure and innovation are crucial for India to revert back to a high-growth trajectory.

Srinagar, Mar 25: A 65-year-old man hailing from Hyderpora area of the city died on Thursday, becoming the first fatality in Jammu and Kashmir due to coronavirus.
"As we share the sad news of our first #Covid19 fatality, my heart goes out to the family of the deceased. We stand with you and share your grief," Mayor of Srinagar Junaid Azim Mattu tweeted.
Government spokesperson Rohit Kansal also confirmed the death via Twitter.
"First death due to Coronavirus- 65 years old Male from Hyderpora Srinagar. Four of his contacts also tested positive yesterday," Kansal said.
Four people had tested positive for coronavirus in J-K on Wednesday, taking the total number of cases to 11.
Authorities in Kashmir have expressed apprehensions that the cases could be more than reported in the Valley as a significant number of people appeared to have concealed their travel history.
As per a government bulletin on Wednesday in Jammu and Kashmir, as many as 5,124 travellers and people who came in contact with suspected and positive cases have been put under surveillance.

Among them 3,061 are in home quarantine (including facilities operated by the government), 80 in hospital quarantine and 1,477 in home surveillance.
Restrictions on movement imposed in Kashmir to prevent the spread of coronavirus were tightened on Wednesday.