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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.

Prime Minister Narendra Modi, who had maintained silence on Chinese aggression and massacre of Indian in eastern Ladakh, now issued a statement saying ‘India wants peace’. He added that India is capable of giving a befitting reply if provoked. 

The prime minister started his meeting with chief ministers on the Covid-19 with a two-minute silence as a tribute to the 20 soldiers who were killed in action in Galwan Valley this week. As he spoke, it became clear that the message was aimed not just at reassuring the nation but also delivering a sharp message to Beijing.

“I would like to assure the nation that the sacrifice of our jawans will not be in vain. For us, the unity and sovereignty of the country is the most important,” PM Modi said. Home minister Amit Shah and defence minister Rajnath Singh were also present in the meeting.

Over twenty Indian soldiers were killed in the violent face-off which took place in Eastern Ladakh on Monday. The troops fought each other with fists and rocks. After the clash, the two sides “disengaged” from the area where the fighting happened, the Indian army statement said. A news agency quoting sources said four Indian soldiers are in critical condition after the face-off.

Defence minister Rajnath Singh mourned the death of 20 Indian soldiers. “The loss of soldiers in Galwan is deeply disturbing and painful. Our soldiers displayed exemplary courage and valour in the line of duty and sacrificed their lives in the highest traditions of the Indian Army,” he said in a statement.

“The Nation will never forget their bravery and sacrifice. My heart goes out to the families of the fallen soldiers. The nation stand shoulder to shoulder with them in this difficult hour. We are proud of the bravery and courage of India’s bravehearts,” the minister further said in the statement posted on Twitter.

These are the first Indian casualties in a border skirmish with PLA since October 1975 when Chinese troops ambushed an Indian patrol in Arunachal Pradesh’s Tulung La sector and shot four soldiers dead.

New Delhi, May 6: The Central Board of Indirect Taxes and Customs (CBIC) has extended the validity of electronic way (E-way) bills, whose expiry date fell between March 20 and April 15, till May 31.

"Notification No. 40/2020-Central Tax issued to extend the validity of e-way bills till May 31 for all those e-way bills which were generated on or before March 24, 2020 and had expiry between the period from March 20 to April 15, 2020," the CBIC tweeted on Tuesday.

E-way bill is produced by transporters and businessmen before a Goods and Services Tax (GST) inspector for moving goods worth over Rs 50,000 from one state to another.