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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.

Mumbai, May 17: Much on expected lines, Maharashtra, on Sunday, extended the coronavirus lockdown till May 31, in order to control the spread of the virus, under the Epidemic Diseases Act, 1897, the state government said in a statement.

On Sunday afternoon, Chief Secretary Ajoy Mehta, in a notification said: "It is further directed that all earlier orders shall be aligned with this order and remain in force up to and inclusive of May 31, 2020. The calibrated phase-wise relaxation or lifting of lockdown orders will be notified in due course."

"Lockdown 3.0 ends today. Lockdown 4.0 will come into effect tomorrow and will be valid till May 31. There will be some relaxations in the fourth phase," he said.

"The green and orange zones will get more relaxations, in terms of starting more services. As of now only essential services are operational, he said.

Maharashtra has recorded 30,706 COVID-19 cases of which 22,479 are active. The death toll is 1135, while 7,088 patients have been discharged after recovery.

In exercise of the powers conferred under Section 2 of the Epidemic Diseases Act, 1898 and the powers, conferred under the Disaster Management Act, 2005, the Chairperson, State Executive Committee, issued direction to extend the lockdown till 31 May 2020 for containment of COVID-19 epidemic in the State and all Departments of Government of Maharashtra shall strictly implement the guidelines issued earlier form time to time, according to the statement.

Over the last two days,  Maharashtra Chief Minister Uddhav Thackeray held a series of meetings with his ministerial colleagues, senior leaders including NCP supremo Sharad Pawar and top officials. 

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.