Fitch revises outlook on nine Indian banks to negative

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, Mar 12: The Supreme Court told the Uttar Pradesh government on Thursday that as of now, there was no law that could back their action of putting up roadside posters of those accused of vandalism during anti-CAA protests in Lucknow.

An apex court bench refused to stay the March 9 Allahabad High Court order directing the Yogi Adityanath administration to remove the posters.

The top court, which grilled the Uttar Pradesh government for putting up such posters in public, described the plea as a matter that needed "further elaboration and consideration".

A vacation bench of justices U U Lalit and Aniruddha Bose said a "bench of sufficient strength" would consider next week the Uttar Pradesh government's appeal against the Allahabad High Court order directing the state administration to remove the posters of those accused of vandalism during anti-CAA protests.

It directed the apex court registry to put up the case file before Chief Justice of India (CJI) S A Bobde so that a "bench of sufficient strength can be constituted at the earliest to hear and consider" the case next week.

During the hearing, the bench told Solicitor General Tushar Mehta, appearing for the Uttar Pradesh government, that it was a matter of "great importance".

It asked Mehta whether the state government had the power to put up such posters.

The top court, however, said there was no doubt that action should be taken against rioters and they should be punished.

Mehta told the court that the posters were put up as a "deterrent" and the hoardings only said that these persons were liable to pay for their alleged acts during the violence.

Senior advocate A M Singhvi, appearing for former IPS officer S R Darapuri whose poster has also been affixed in Lucknow, told the bench that the state was duty-bound to show the authority of law backing its action.

He said the action of the Uttar Pradesh government amounted to a "mega blanket" approach of naming and shaming these persons without final adjudication and it was an open invitation to common men to lynch them as the posters also had their addresses and photographs.