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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.

Ahmedabad, Feb 24: US President Donald Trump and his wife Melania on Monday tried their hands at spinning the 'charkha' (spinning wheel) at the Sabarmati Ashram here.

Accompanied by PM Narendra Modi, the US president and his wife went around the Ashram, before resuming the roadshow from the airport to the Motera stadium. "To my great friend Prime Minister Naredra Modi, thank you for this wonderful visit," Trump wrote in the Ashram visitors' book.

The US President was briefed about Gandhiji and the importance of charkha as a symbol of self reliance. Trump reached Ahmedabad at 11.37 am for the first leg of his India visit.

US President Donald Trump arrived in Ahmedabad on Monday for the first leg of his India trip. The Air Force One plane carrying Trump and his wife Melania landed at the Sardar Vallabhbhai Patel international airport here at 11.37 am, officials said. It was scheduled to land at 11.40 am.

Trump, who is also accompanied by daughter Ivanka, son-in-law Jared Kushner and top brass of his administration, will get a taste of India's cultural melange during his high- optics Gujarat itinerary, after the bonhomie between the two leaders at the 'Howdy, Modi!' event in Houston last year.

New Delhi, Jan 16: Chief of Defence Staff (CDS) General Bipin Rawat on Thursday said that he supported a negotiated peace deal between the US and Taliban in Afghanistan.

Gen. Rawat was speaking along with other world leaders at Raisina dialogue organised by India's influential think-tank Observer Research Foundation (ORF).

Arguing that terrorism was going to stay in the world as long as states were going to use it against other states, he said it was important to prevent states from using terrorism as a "proxy war".

"The only way to deal with it was what the US did post 9/11," he said, adding that the war against terror was necessary.

However, now a peace deal with Taliban is required, Gen. Rawat said.

"It must be a negotiated peace deal so that the Taliban stops using terrorism," he added. Hinting that the US should maintain its presence in Afghanistan, the CDS said that though Afghan security forces are now equipped to fight back terror groups in Afghanistan but they still need support.

The newly appointed CDS officially confirmed that India has shifted its stance on Taliban. India has traditionally been opposed to the Pakistan-backed Taliban in Afghanistan. Thousands of Afghans were given refuge in India when they fled the country due to oppression and terrorism of the Taliban regime. India is in alignment with the democratically elected government in Kabul that the Taliban remains supported by Pakistan.