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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 13: Veteran Urdu poet Anand Mohan Zutshi 'Gulzar' Dehlvi passed away on Friday afternoon, five days after he recovered from COVID-19.

He died at his Noida home, and was a month shy of turning 94.

"His corona test came negative on June 7 and we brought him home. Today he had lunch and at around 2.30pm he passed away," his son Anoop Zutshi told PTI.

"He was quite old, and the infection had left him very weak. So doctors are thinking it was possible a cardiac arrest," he added.

A freedom fighter and a premier 'inquilabi' poet, Dehlvi was admitted to a private hospital on June 1 after testing positive for coronavirus.

Born in old Delhi's Gali Kashmeerian in 1926, he was also the editor of 'Science ki Duniya', the first Urdu science magazine published by the Government of India in 1975.

Remembering her fond memories of Dehlvi, historian-writer Rana Safvi recalled seeing the poet at most 'mushairas' in Delhi.

"I cannot express how big a loss it is. We used to see him at every 'mushaira' in Delhi. It's a big loss to Delhi and the world of poetry," Safvi said.

She also took to Twitter to express her condolences.

"Sad to hear about Gulzar Dehlvi saheb's demise. He was the quintessential Dilli waala. May he rest in peace," she tweeted.

According to Delhi-based poet and lawyer Saif Mahmood, Dehlvi was "the presiding bard of Delhi", following in the footsteps of iconic poets like Mirza Ghalib, and Mir Taqi Mir.

His death is the "end of an era", he said.

"No one knew the nooks and crannies of Mir and Ghalib's Delhi like him. Gulzar saheb claimed that his father, Allama Pandit Tribhuvan Nath Zutshi 'Zaar Dehlvi', was a disciple of the renowned poet Daagh Dehlvi," he said, while reminiscing his meeting with Dehlvi three years back.

The poet had recited a still unpublished 'sher' (couplet) then, Mahmood said, which seems more relevant now in the aftermath of his demise.

"Mere baad aane waalon, meri baat yaad rakhna/ mere naqsh-e-pa se behtar, koi raasta nahin hai". (Those who come after, remember what I say/ there’s no better way than to follow my footprints).

"He was a true exemplar of not just the Urdu language but also of the Urdu culture. In fact he was a living and breathing form of Urdu tehzeeb," Mahmood said.