Half of Narendra Modi's Twitter followers are fake, claims social media firm

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.

Kolkata, Jan 15: The arrows of Mahabharata's Arjuna had atomic power, claimed West Bengal Governor Jagdeep Dhankhar, drawing sharp criticism from academicians, even as he joined a long list of politicians who have in recent years given bizarre interpretations linking mythology with science.

Speaking at the 45th Eastern India Science Fair and 19th Science and Engineering Fair on Tuesday, Dhankhar also claimed that flying objects existed during the period of Ramayana.

"It is said that the plane was invented in 1910 or 1911, but if we delve into our old scriptures we will see in Ramayana, we had 'uran khatola' (aircraft)," he said.

"Sanjaya narrated the entire war of Mahabharata (to Dhitarasthra) not from TV. The arrows of Arjuna in Mahabharata had atomic power in it," Dhankhar said, asserting that the world can no longer afford to ignore India.

According to Sanskrit epic Mahabharata, Sanjay, even after staying away from the battlefield, had narrated what was happening there to Dhritarashtra, who was blind.

Dhankhar, who has been in news for clashes with the Mamata Banerjee government ever since he assumed office in July last year, joins politicians such as Tripura Chief Minister Biplab Deb and UP deputy chief minister Dinesh Sharma to give odd interpretations of mythology.

While Deb had claimed that the internet existed during Mahabharata, Sharma suggested that godess Sita was a test tube baby.

Recently, Puducherry Lt Governor Kiran Bedi was trolled online for sharing a doctored video that claimed, "NASA recorded sound of sun -- Sun chants Om".

Indologist Nrisingha Prasad Bhaduri said governors appointed by the BJP government at the Centre are delving into everything and behave "as if they are know-alls".

"They fail to understand one thing that great writers have very strong power of imagination," Bhaduri said.

Scientist Sandip Chakraborty said such comments only hurt the scientific progress in India at the global forum.

"The ancient writers described all these things based on their imagination. It is true that India made a lot of progress during the ancient period, but such comments only damages the progress made by our scientific community," he said.

New Delhi, Mar 20: Prime Minister Narendra Modi on Monday appealed to state governments to ensure that rules and regulations of the coronavirus lockdown are enforced as he noted that many people are not taking the measure seriously.

"Many people are still not taking the lockdown seriously. Please save yourself, save your family, follow the instructions seriously. I request state governments to ensure rules and laws are followed," he said in a tweet in Hindi.

The Centre and state governments have decided to completely lock down 80 districts across the country where coronavirus cases have been reported.

Uttar Pradesh, Maharashtra, Punjab, Karnataka, Tamil Nadu and Kerala announced lockdown in many districts.

Delhi will be locked down from 6 am on March 23 till midnight on March 31.