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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, Mar 29: Virologist Minal Dakhave Bhosale led from the front to create India's first coronavirus testing kit even when she was in the last stage of her pregnancy.

Bhosale's efforts paid the price with her team delivering the testing kit in a record time of six weeks.

Bhosale gave birth to a baby girl just a day before submitting the kit to the authorities for evaluation.

"It was like giving birth to two babies," Bhosale told PTI over the phone.

The virologist said both the journeys - that happened in parallel - were not without challenges.

"There were complications in the pregnancy while work on the test kit was on. The baby was delivered through cesarean," she said.

Bhosale said she felt that it was the right time to serve the people to help them in combating the coronavirus threat.

"I had been working for five years in this field and if I don't work in emergency situations when my services are needed the most, then what is the use?" she said.

Though Bhosale was not able to visit the office due to the pregnancy, she was guiding a team of 10 persons working on the project at Mylab Discovery in Pune.

The strong bonds forged with the team over the years and their support made it possible, she said.

Company's co-founder Shrikant Patole said just like drug discovery, test kits too go through a lot of quality checks to improve the precision.

He credited Bhosale for the success of the project.

The COVID-19 testing kit delivered by Bhosale's team will reduce the time taken for delivering a result to 2.5 hours from the prevalent practice of eight hours.

A pioneering approach to testing without compromising on the results was adopted, Bhosale said.

The Maylab test kit will cost Rs1,200, a quarter of Rs 4,500 per kit that the government has been spending on testing so far.

"I'm happy that I could do something for the country," Bhosale said.

As of Friday, only 27,000 of the 1.3 billion people were tested for the virus in the country.

According to experts, high scale testing is essential because it alone can ensure an early diagnosis of COVID-19 and lower down the fatalities.

The company is confident of ramping up the capacity at its plant in Lonavala to deliver 100,000 kits a week, Patole said.

He said the authorities are helping the company, including giving priority for shipping of the raw materials.

New Delhi, Mar 19: Former Chief Justice of India Ranjan Gogoi took oath as Rajya Sabha MP on Thursday.

Gogoi's wife Rupanjali Gogoi, daughter, and son in law were also present in Parliament.

Congress staged a walkout from the Rajya Sabha over Gogoi's membership to the House.

Meanwhile, Union Minister Ravishankar Prasad welcomed Gogoi in the Rajya Sabha.

President Ram Nath Kovind had nominated the former CJI to the Rajya Sabha on March 16.

Gogoi served as the 46th Chief Justice of India from October 3, 2018, to November 17, 2019.

On November 9, 2019, a five-judge Bench headed by him had delivered the verdict in the long-pending Ramjanmabhoomi case.