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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, Apr 27: Prime Minister Narendra Modi on Monday held a video conference with chief ministers to discuss the situation arising due to the coronavirus pandemic in the country, which has been under a lockdown since March 25 to contain the spread of the virus, amid indications that the interaction would also focus on a graded exit from the ongoing lockdown.

This is Modi's fourth such interaction with state chief ministers since March 22 when he discussed coronavirus situation and steps taken both by the Centre and the states to contain the pandemic.

Two days later on March 24, Modi announced a 21-day nationwide lockdown. He extended the lockdown by 19 days on April 14, the last day of the initial three week shutdown, till May 3.

Sources in the government had on Sunday indicated that besides discussing the way forward in dealing with the pandemic, the prime ministers and chief ministers could also focus on a "graded" exit from the lockdown.

In a tweet on Monday, the Prime Minister's Office said Modi and the chief ministers will be discussing aspects relating to the COVID-19 situation.

In his monthly 'Mann ki Baat' radio address on Sunday, the prime minister said the country is in the middle of a 'yudh' (war) and asserted that people have to continue being careful and take precautions.

His note of caution came amidst gradual exemptions being granted by the Centre and states to revive economic activities.

"I urge you not to get overconfident. You should in your over-enthusiasm not think that if the coronavirus has not yet reached your city, village, street or office, it is not going to reach now. Never make such a mistake. The experience of the world tells us a lot in this regard," Modi said while referring to a popular Hindi idiom 'Sawdhani hati, durghatna ghati' (disaster strikes when you lower your concentration).

The Centre and the state governments have been giving gradual exemptions to boost economic activities as also to provide relief to people as some states want further relaxation in areas which have seen few or no coronavirus cases.

Mumbai, Jan 7: People protesting against the JNU violence were evicted from Gateway of India here on Tuesday morning as roads were getting blocked and tourists and common people were facing problems, a police official said.

Police had appealed to the protesters to shift but they didn't listen, so they were "relocated" to Azad Maidan, the official said.

Hundreds of people, including students, women and senior citizens - who assembled at the iconic Gateway of India since Sunday midnight - demanded action against the culprits and called for Union Home Minister Amit Shah's resignation.

Violence broke out in the Jawaharlal Nehru University (JNU) in Delhi on Sunday night as masked men armed with sticks and rods attacked students and teachers and damaged property on the campus.