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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, May 23: On the occasion of Jumat-ul-Vida, the last Friday of the ongoing holy month of Ramzan, a select group of people offered namaz at Delhi's Jama Masjid ahead of Eid-ul-Fitr, while adhering to social distancing following relaxations in the fourth phase of the COVID-19 lockdown.

"A large number of people wanted to offer prayers today but we told them they should do so from their homes. Only the staff of the mosque and a few members of the family offered prayers here," Shahi Imam of Jama Masjid said.

The coronavirus pandemic has also marred the excitement of Eid for the vegetable and fruit vendors in neighbouring Daryaganj.

The fourth phase of nation-wide lockdown extended till May 31, began from Monday in which markets and shops were allowed to open. However, due to persisting fear of COVID-19, the sale of products is yet to pick pace.

Unlike each year, the market lacks the sheen this Eid with no bustle and people cautious about venturing out.

Salim, who has been selling cheese and curd in the market for the last 35 years, told ANI, "I have never seen such an Eid. There is an atmosphere of fear in the minds of people."

Another fruit seller Haseen Malik said that "During the month of Ramadan, most people relish fruits such as musk melon, sweet lemon and watermelon so there is some demand for it. But there is no excitement for Eid this year. The sale has been at an all-time low because of the lockdown."

In the wake of the festival and to ensure social distancing, Delhi Police has made elaborate security arrangements. 

New Delhi, Jan 13: The Jawaharlal Nehru University Students' Union (JNUSU) has alleged that the varsity administration has blocked the registration of 300 students on the basis of 'fake Proctor inquiries'.

The union had on Saturday asked students of the university to pay their academic tuition fee but not the hiked hostel fee.

"Today the Vice Chancellor first blocked the fee payment portal and then blocked the payment of tuition fees. It is clear that the VC was lying through the teeth when he said students want to register but are not being allowed to by protesters," JNUSU president Aishe Ghosh said.

She said the VC has also blocked the registration of 300 students based on fake proctor enquiries which are not even completed.

"The truth is that it is the administration which does not want students to register and is blocking their registration," she said.

JNUSU vice president Saket Moon said that in the meetings held in HRD ministry, it was decided that the administration would take a lenient view on the students' protest and not take action against them.

He said many students, who opened the portal for registration found they had been academically suspended and could not register.

He said the JNUSU had softened its stand by saying that they would register by paying the old fees but that has been kept on hold.

On Sunday, the administration extended the date for the winter semester registration till January 15.