HC issues notice to PM Modi over preventing ex-soldier from contesting against him

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.

Feb 4: Amid the agitations against Citizenship Amendment Act, National register of Citizens and National Population Registration across the country, Prime Minister Narendra Modi on Monday said that there is a "political design" behind all these protests including in Delhi's Jamia and Shaheen Bagh to ruin the harmony of the nation.

"Be it Seelampur, Jamia or Shaheen Bagh, protests held over the past several days regarding the Citizenship Amendment Bill. Is this just a coincidence? No. This is an experiment," said Prime Minister Narendra Modi in his first election rally for Delhi polls at Karkardooma.

"There is a political design behind all these protests including Jamia and Shaheen Bagh. These protests are a conspiracy to divide India. These protests are going to ruin the harmony of the nation," he asserted.

Lambasting the opposition parties including Congress and Aam Aadmi Party for supporting the ongoing protests, he said: "But AAP and Congress are provoking people. Constitution and tricolor are being kept in front and attention is being diverted from the real conspiracy."

"These people were doubting the ability of our forces during surgical strikes. Do citizens of Delhi want such people in power? These people are saving those who want to break India into pieces," he added.

People have been protesting at Jamia and Shaheen Bagh against CAA, NRC and NPR. Members of the Opposition have deemed CAA "discriminatory and anti-Constitution" while the Centre has maintained that the new law has no effect on Indian citizens.

Recently, two firing incidents took place near Jamia Millia Islamia University.On Sunday night, the firing incident was reported near gate number five at the university following which people including some students of the varsity gathered outside the Jamia Nagar police station. They returned from the Jamia Nagar police station after their complaint was registered.

Earlier, a student sustained injuries after a young man fired at the protestors near Jamia.