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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.

Thiruvananthapuram, Mar 30: Kerala reported 32

fresh cases of coronavirus on Monday, with the worst affected Kasaragod district alone accounting for 17 cases.

Kannur reported 15 cases, while Wayanad and Idukki reported two each, Chief Minister Pinarayi Vijayan told reporters here after a COVID-19 review meeting.

Of the 32 cases, 17 had come from abroad and 15 had been infected through contact.

A total of 213 people are presently under treatment in Kerala.

At least 1.50 lakh people are under surveillance in the state and 623 are in isolation wards of various hospitals.

Washington, Feb 16: India and the United States share "unshakeable" ties, said US Principal Deputy Assistant Secretary (PDAS), Alice Wells, on Sunday, adding that the upcoming visit of President Donald Trump will further strengthen the relationship between the two countries.

"The U.S. and #India enjoy a close partnership that grows stronger day by day. Together, we are breaking records. For example, we welcomed a record number of Indian exchange students to the US last year and hope to receive even more this year," said Bureau of South and Central Asian Affairs in a tweet attributed to Alice Wells.

"The ties between our countries are unshakeable, and we look forward to an even warmer relationship as @narendramodi hosts @POTUS later this month," it added.

Trump will pay a two-day state visit to India from February 24 at the invitation of Prime Minister Narendra Modi.

"India is at the heart of the Indo-Pacific region and plays an increasingly prominent role on the world's stage. The U.S. looks forward to partnering with #India at every step of the way, " Alice Wells further said.

According to the Ministry of External Affairs (MEA), Trump is expected to attend an event at the Motera Stadium in Ahmedabad on the lines of the ''Howdy Modi'' function that was addressed by the US President and PM Modi in Houston in September last year. Trump is slated to pay a two-day visit to India from February 24.

During the visit, Trump, who will be accompanied by First Lady Melania, will attend official engagements in New Delhi and Ahmedabad, and interact with a wide cross-section of the Indian society, the MEA said in a statement.

The announcement of Trump's first official visit to India was earlier made by the White House on Monday, which, in its statement, said that the US President and Modi had agreed during a recent phone conversation that the trip will "further strengthen the United States-India strategic partnership and highlight the strong and enduring bonds between the American and Indian people".