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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.

Mumbai, Jan 18: Maharashtra Tourism Minister Aaditya Thackeray on Friday said shops, restaurants, malls and pubs will remain open 24 hours on an experimental basis in a few areas of Mumbai from January 26.

The areas where these establishments will remain open all night are Fort and Kala Ghoda in south Mumbai and Bandra Kurla Complex in the west.

Thackeray had batted for all-night-open eateries and other establishments in the city during the earlier BJP-Shiv Sena regime too.

New Delhi, Mar 7: Bhim Army chief Chandrashekhar Azad has taunted Bahujan Samaj Party chief Mayawati saying that she has lost her way. He also said that one will have to work for the larger interest of the society to bring about equality. Only the speeches cannot improve the condition of the Dalits, their participation in power must increase.

In an interview with media persons, Chandrashekhar said: "Members of minority community, Dalits and backward classes are being targeted in the country. Their rights are being taken away. Our workers want that they too should get equal share in political power. Keeping this in mind, we are going to form a new political party on March 15. Their (Dalits) issues will have to be raised. Mere speeches will not work for Bahujan society, one has to raise voice in their favour. They should get a share in power."

On the question that how he would find a foothold in view of large political base of the BSP, Chandrashekhar said, "We are not looking for an alternative. Look at the crores of Muslims, Dalits, members of backward community and minorities. We have to protect their interests. We have a large organisation in the state. Our Bharat Bandh was also successful".

On the question that with which party he will forge an alliance in 2022 after forming his party on March 15, Chandrashekhar said: "When we are forming our party then we don't need to go seeking alliance with anyone. Our party will be formed on the basis of some principles. Whoever will find it suitable will come close to us".

On meeting with Yogi government's former minister Om Prakash Rajbhar, he said that Rajbhar is not a controversial person. He is a big backward leader. He raises voice in favour of the backwards in the Assembly. He also supported us when I was in jail. We talked about how to stop the BJP and will take all necessary steps to prevent the BJP from coming back to power.

When asked why he had several run-ins with the police, Chandrashekhar said: "Ask this question to the police. Have I broken any law? Am I not a citizen of this country? There is no freedom of speech in the Yogi government. This is happening at the behest of the government. We are just opposing it".

Talking about the CAA, NRC and the NPR, he said: "We will not stage protest because the government does not want it. Any law which is wrong in our view will be opposed. This is a secular country. The CAA will divide the country. If there is anything against the Indian Constitution, we will raise our voice. Laws will not be allowed to be made on the basis of religion".