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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, Apr 28: Nafisa Ali took to Instagram to share the inspiring story of her niece, Diya Naidu, who donated her plasma to help patients suffering from Covid-19 after recovering from the disease. The veteran actress shared a photo of her niece from the hospital bed and asked fans to read Diya's post to get a detailed account of her experience.

Nafisa wrote, "Diya Naidu my niece - a COVID19 hero - is back home after donating her plasma - looks like liquid gold - it’s value is priceless as it will save lives. So please read her COVID19 story and share the information that is first hand. It is the need of the hour. Help save lives. #diyanise. #diyanaidu #covid_19 #india (sic)."

Diya Naidu, who is a dancer and choreographer based in Bengaluru, revealed in her Instagram post that she has donated her plasma for other Covid-19 patients. She said that the method has been super effective wherever it's been tried.

Earlier, Nafisa Ali gave a shout-out to her niece on Instagram and penned a heartfelt note for her. She wrote, "I am so grateful to you brave child - a COVID19 warrior (living in Bangalore) has agreed to donate her plasma to help cure other COVID19 serious patients (sic)."

Explaining the process of plasma therapy to treat Covid-19 patients, she wrote, "The process of donating plasma to treat COVID-19 is not very complex and can be done in just two hours. One of the most discussed methods of treatment of the disease caused by the novel coronavirus is plasma therapy, which involves the transfusion of plasma from a convalescent coronavirus patient to a critical patient. The blood of a recovering patient is rich in antibodies produced by the body to fight the virus, which are expected to help the critical patient recover (sic)."

Plasma therapy has been suggested to treat people suffering from Covid-19. People, who have recovered from the disease, are donating plasma as it contains antibodies to fight the disease. Earlier, Kanika Kapoor, who was the first Bollywood celebrity to be diagnosed with the disease, also offered to donate her plasma. She has recovered from Covid-19 and is currently living with her family in Lucknow.