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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 15: With an increase of 3,967 COVID-19 cases in the last 24 hours, India's tally of coronavirus cases reached 81,970 cases, according to the Union Ministry of Health and Family Welfare on Friday.

According to the latest figures, 51,401 patients are active coronavirus cases while 27,919 patients have been cured/discharged and one patient has been migrated.

With a rise in 100 deaths due to COVID-19 in the last 24 hours, the number of deaths now stands at 2,649.

According to the Health Ministry, Maharashtra is the worst-hit state with regard to the number of COVID-19 cases with 27,524 cases of which, 6,059 patients have been cured/discharged and 1,019 succumbing to the virus.

Tamil Nadu has a tally of 9,674 cases inclusive of 2,240 patients cured/discharged and 66 fatalities.

Gujarat has a total of 9,591 cases which include 3,753 patients cured/discharged while 586 have lost their lives due to coronavirus.

Delhi has a tally of 8,470 cases of which 3,045 patients cured/discharged and 115 fatalities.

Lucknow, Jan 12: The controversy over renowned Pakistani poet Faiz Ahmad Faiz's iconic poem 'Hum dekhenge' may have caused an upheaval in the literary world but it has also helped in resurrecting the famous poet for the young generations.

Students and young professionals are making a beeline for books on Faiz, his biography and his poems and book sellers are ordering supplies of Faiz books.

"Earlier, we sold hardly one book in a month or on Faiz but after the controversy, people are curious to know more about the poet and his poems. We have placed orders for the entire literary range on Faiz Ahmad Faiz," said a leading book seller in Hazratganj in Lucknow.

The bookseller said that the highest demand was for books written in Devnagri script.

"Not many in the young generation can read or write Urdu so they prefer Devnagri," the book seller said.

In Kanpur, most of the leading bookshops have already run out of stocks and book stalls in the ongoing Handloom Expo are drawing huge crowds for Faiz books.

Suchita Srivastava, B.Ed student in Kanpur said, "I have never been fond of Urdu poetry because I do not understand much of the language but after the controversy, I want to read poems of Faiz to understand what he wanted to say. I am taking help of Google to understand difficult words in Urdu."

Krishna Rao, another student at the Chandra Shekhar Azad University of Agriculture and Technology, said that since books on Faiz had been sold out, he had ordered a Kindle edition and was reading them.

"Reading his poems actually widens one's perspective of things and becomes even more precious if you take into account the time and context in which they were written," he said.