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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, Jul 26: Nidan Singh Sachdeva, the Afghan Sikh who was kidnapped a month ago and released recently, arrived here earlier in the day and narrated the ordeals that he faced at the hands of abductors and also thanked the Indian government for bringing him back to his 'motherland'.

Facing threats from Pakistan-backed Taliban, eleven members of Sikh community from Afghanistan, who were granted short-term visas by Indian Embassy in Kabul, including Sachdeva, who was abducted from a gurudwara in Paktia province last month, touched down in New Delhi on Sunday afternoon.

Speaking to news agency on his return, an emotional Sachdeva, said, "I don't know what to call Hindustan -- whether it is my mother or my father -- Hindustan is Hindustan."

"I was abducted from the gurudwara and 20 hours later, I was covered with blood. I was tied to a tree as well. They used to beat me and ask me to convert into a Muslim. I repeatedly told them that why should I convert, I have my own religion," he said while describing
Nidan Singh thanked Government of India for bringing him here.

"I am more than thankful to the Indian government for bringing us here to our motherland. I have no words to describe my feelings here. I arrived here after much struggle. The atmosphere of fear prevails there.

Gurudwara is where we can be safe but a step outside the Gurdwara is fearful," he said.
"They used to beat me every day and every night," he said further and added, "It is because of sheer happiness, I am speechless. I am very grateful to them."

Ministry of External Affairs recently announced that India has decided to facilitate the return of Afghan Hindu and Sikh community members facing security threats in Afghanistan to India.
The decision comes four months after a terror attack at a gurdwara in Kabul's Shor Bazaar killed at least 25 members of the community.

India has condemned the "targeting and persecution" of minority community members by terrorists in Afghanistan at the behest of their external supporters remains a matter of grave concern.

Leaders of the Afghan Sikh community have appealed to the Indian government to accommodate the Sikhs and Hindus from Afghanistan and grant them legal entry with long term residency multiple entry visas.

Once a community of nearly 250,000 people, the Sikh and Hindu community in Afghanistan has endured years of discrimination and violence from extremists, and the community is now estimated to comprise fewer than 100 families across the country.

New Delhi, Mar 25: The total number of confirmed coronavirus cases in India rose to 562, according to the Ministry of Health and Family Welfare on Wednesday.
This includes 512 active cases, while 40 infected people have already been cured or discharged.
The Union Health Ministry said that total deaths due to the disease now stand at 9, as the second death reported in Delhi is COVID-19 negative. One patient has also migrated due to the infection.
The Central government has taken several steps to contain the rapid spread of the virus including the screening 15,24,266 passengers at the airports.
Prime Minister Narendra Modi had on Tuesday announced a 21-day lockdown in the entire country effective from midnight to deal with the spread of coronavirus, saying that "social distancing" is the only option to deal with the disease, which spreads rapidly.
In a televised address to the nation, Prime Minister Modi said that it is vital to break the chain of the disease and experts have said that at least 21 days are needed for it.
The Prime Minister, who had also addressed the nation last week, said the lockdown has drawn a "Lakshman Rekha" in every home and people should stay indoors for their own protection and for that of their families.