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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.

Warangal, Jul 22: Amid the COVID-19 pandemic, an outlet in Telangana's Warangal has started selling 'anti-corona' tea. The tea has become an instant hit with the locals as the beverage is laced with natural immunity-boosting ingredients.

"We sell tea named 'anti-corona'. It has natural immunity-boosting ingredients such as ginger, black pepper, cinnamon powder, among other things. A mixture of these ingredients boosts our immunity," Shiva, the owner of the tea shop said.

"Better immunity is needed to fight the coronavirus infection in the body. So we have started preparing this tea and selling it during the coronavirus pandemic," he added.

Prabhakar, a customer at the tea stall said, the tea was a "corona special tea," and it has Ayurvedic mixtures which help to boost the immunity of the human body.

"The tea is prepared after adding the Ayurveda mixtures to milk. This is good for your health. I, along with my family members and friends, come here every day. We drink this tea thrice a day," Prabhakar added.

According to the Union Health Ministry, there are 46,274 COVID-19 cases in Telangana. Meanwhile, India's coronavirus count stood at 11,92,915 on Wednesday morning.

New Delhi, Jan 18: The Supreme Court Friday refused to entertain a PIL seeking conferment of 'Bharat Ratna' on Mahatma Gandhi saying that people hold the father of the nation in “high esteem”, beyond any formal recognition.

A bench, comprising Chief Justice S A Bobde and justices B R Gavai and Surya Kant, however asked petitioner Anil Dutta Sharma to give representation to the central government in this regard.

“Mahatma Gandhi is the father of nation and people hold him in high esteem, beyond any formal recognition,” the bench said.

The issue of directing the government to award Bharat Ratna to the father of the nation was not a “justiciable issue”, it said.

The bench however said that it agreed with the sentiments of the petitioner for granting official decoration to Mahatma Gandhi.

Disposing of the petition, the top court said, “We will allow you to give a representation to the Centre in this regard.”

Sharma, in his PIL, had sought a direction to the government to give “official decoration” to Mahatma Gandhi to honour him for the contribution to the nation.