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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, Jul 3: India reported the highest ever single-day spike of 20,903 COVID-19 cases in 24 hours on Friday, said the Union Ministry of Health and Family Welfare.

With these new cases, India's coronavirus tally has risen to 6,25,544 cases of which 2,27,439 patients are active cases while 3,79,892 patients have been cured/discharged/migrated.

379 more deaths due to COVID-19 were reported in the country in the last 24 hours, taking the number of deaths due to the infection to 18,213.

As per the Health Ministry, Maharashtra -- the worst-affected state from the virus -- has a total of 1,86,626 cases including 8,178 fatalities while Tamil Nadu has 98,392 coronavirus cases in the state inclusive of 1,321 fatalities.

Delhi has reported 92,175 cases so far inclusive of 2,864 patients succumbing to the virus.

The Indian Council of Medical Research on Friday said that the total number of samples tested till July 2 is 92,97,749 of which 2,41,576 samples were tested on Thursday.

Jan 30: BJP leader and West Bengal party head, Dilip Ghosh has yet again made a controversial statement. He said that one has to go to jail in order to gain respect or become a political leader.

"You will not be a leader if you don't go to jail, if Police don't take you, then you must go there yourself. If they don't give you any scope, you do something to go to jail, only then will people respect you. There is no place for soft people in politics," ANI quoted Ghosh as saying.

Earlier, Ghosh had triggered a controversy by saying that anti-CAA protestors in Assam and Uttar Pradesh were shot dead "like dogs", and similar punishment should be given to protestors in Bengal.