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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.

New Delhi, Jun 2: Manu Sharma, a convict in the 1999 Jessica Lal murder case, was released from Tihar Jail yesterday on the grounds of good behaviour after serving more than 16 years in prison, jail officials said on Tuesday.

Sharma had received the approval of the Lieutenant Governor of Delhi for his release after a recommendation of the Sentence Review Board for the same.

Advocate Amit Sahni, while speaking to ANI, had said that Delhi Lieutenant Governor Anil Baijal had approved the name of Siddharth Vashishth also known as Manu Sharma for release from Tihar Jail.

He said that Sharma's name was approved in a sentence review board meeting held on May 11. Earlier, Delhi High Court had also asked the SRB to consider his name for release.

Sharma, the son of former Congress leader Venod Sharma, was convicted for shooting and murdering Jessica Lal, when she refused to serve him liquor at Tamarind Court restaurant at Qutub Colonnade in south Delhi's Mehrauli on April 29, 1999.

Vashishth, 45-years-old, was serving a life term in connection with a case registered under Section 302 (murder), 201 (causing disappearance of evidence of the offense or giving false information to screen offender) and 120B (criminal conspiracy) of the Indian Penal Code (IPC).

According to officials, the convict has undergone imprisonment for 16 years, 11 months and 24 days in actual, and 23 years 4 months and 22 days with remission. He has availed parole 12 times and furlough 24 times.

Earlier, Manu's wife -- Preity Sharma -- had approached the National Human Rights Commission (NHRC) claiming that her husband had been illegally detained for more than the prescribed period of incarceration (20 years with remission) as per the prevalent policy of the state.

Feb 14: India will never forget the martyrdom of the security personnel killed in last year's Pulwama attack, Prime Minister Narendra Modi said on Friday.

He termed the slain security personnel were "exceptional individuals" who devoted their lives to serving and protecting the nation.

On February 14 last year, a convoy of vehicles carrying security personnel on the Jammu-Srinagar National Highway was attacked by a vehicle-borne suicide bomber at Lethpora in Pulwama district of Jammu and Kashmir. Forty Central Reserve Police Force (CRPF) personnel were killed in the attack.

"Tributes to the brave martyrs who lost their lives in the gruesome Pulwama Attack last year. They were exceptional individuals who devoted their lives to serving and protecting our nation. India will never forget their martyrdom," tweets PM Modi one year since the Pulwama attack.

"I pay homage to the martyrs of Pulwama Attack. India will forever be grateful of our bravehearts and their families who made supreme sacrifice for the sovereignty and integrity of our motherland," tweets Union Home Minister Amit Shah.