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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.

Shirdi, Jan 18: The administrative body of Sai Baba's Samadhi calls for the indefinite closure of the Shirdi temple after Maharashtra Chief Minister Uddhav Thackeray reportedly said Pathri in Parbhani is Sai Baba's birthplace.

"We have announced to close Shirdi against rumours from January 19," said B Wakchaure of Saibaba Sansthan Trust.

"A meeting of villagers will be convened Saturday evening to discuss the issue. Devotees will not face any difficulty if they come to Shirdi," Mr Wakchaure added.

Feb 22: Prime Minister Narendra Modi is unlikely to accompany US President Donald Trump and his family members during their visit to the Taj Mahal in Agra on Monday, official sources said.

The US President will arrive in Ahmedabad at around noon on February 24 for a less that 36-hour visit to India. He will be accompanied by a high-level delegation including First Lady Melania Trump, the President's daughter Ivanka Trump, son-in-law Jared Kushner and a galaxy of top US officials.

After attending an event at Ahmedabad, the Trumps will travel to Agra on Monday afternoon to visit the Taj Mahal before arriving at the national capital for the main leg of the visit.

When asked about reports that Modi may accompany Trump to Agra, official sources said there was no such plan.

They said the visit to the Taj Mahal in Agra by the US President and his family members will afford them the opportunity to view the historical monument suitably. Therefore, no official engagements or presence of senior dignitaries from the Indian side is envisaged there, the sources said.