Modi justifies fielding terror accused Pragya Thakur, conducting I-T raids

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.

Dehradun, Jun 13: Chief of Army Staff General M M Naravane on Saturday said the country is passing through difficult times and its safety and honour depend on the ability of its young officers as military leaders.

Addressing gentlemen cadets at the Indian Military Academy here as the reviewing officer of a passing out parade, Gen Naravane said they are being commissioned as officers into the army under the most daunting of circumstances and the high standards of their military training will help them overcome the challenges lying in store for them.

The parade saw a total of 423 cadets being commissioned into the army including 333 from the country and 90 from friendly foreign countries.

"These are difficult times for the country. Its safety, honour and respect depend on your abilities as military leaders. You have to live up to the expectations of your countrymen. You have to ensure that whatever you do is for their welfare," he said.

The army chief said there are no good or bad regiments but only good officers.

"Become one with your men. Win their trust and affection and they will win battles for you," Naravane said.          

He asked the gentlemen cadets to throw themselves into their new role as commissioned officers with passion but also be compassionate towards their men.

"When the going gets tough and all seems lost, it is the spirit of your men that helps you win," he said.          

He said the gentlemen cadets who are taking their first step as commissioned officers will have to make decisions in the tactical and operational domain as well as resolve ethical issues and they will have only their conscience to guide them.          

"In such critical moments let the core values enshrined in the preamble of the constitution of India be your guiding light," the Army Chief said.

Asking them to rise above petty considerations of caste, creed and religion, he said the army does not discriminate.

Apart from containing the external threats, you may also have to defang internal forces out to destabilise the country.

He said the precise drill movements of the cadets had convinced him they will do their respective countries proud.

"In the autumn of your careers what will matter is not the position you finally attain but how honourably you have served your nation," he said.              

In a message to the gentlemen cadets' parents, who were not allowed to attend the event due to the coronavirus pandemic, the Army Chief said, "Till yesterday they (gentlemen cadets) were your children but from tomorrow they will be ours."

He promised to be with them through thick and thin.

The parade looked slightly off-colour this time with the enthusiastic crowds of parents and some usual features missing like the showering of the drill square with flower petals by helicopters.