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New Delhi, Feb 22: China is delaying grant of clearance to India's proposal to send an Indian Air Force flight to carry relief material for people affected by coronavirus in the neighbouring country and bring back Indians from its city of Wuhan, official sources said Saturday.

India was to send a C-17 military transport aircraft to Wuhan, the epicentre of the coronavirus outbreak, on February 20 but the plane could not take off as permission was not granted for the flight.

"China is deliberately delaying grant of clearance for the evacuation flight," a high-level source said.

The aircraft was to carry a large consignment of medical supplies to China and bring back more Indians from Wuhan.

Sources said the Chinese side continued to maintain that there was no delay in granting permission for the flight to go, but "inexplicably" the clearance has not been given.

In a letter to President Xi Jinping earlier this month, Prime Minister Narendra Modi conveyed India's solidarity to the people and government of China in meeting the challenge of the coronavirus outbreak and offered to provide assistance to the country.

India then put together relief supplies in pursuance of Modi's commitment as a token of India's solidarity, particularly in the 70th year of the anniversary of diplomatic relations between the two countries.

"These supplies have been offered even as India faces tremendous shortage itself, given our ethos of helping others in their hour of need," said a source aware of the issue.

The items being supplied are gloves, surgical masks, feeding pumps and defibrillators based on the requirements as indicated by the Chinese side.

India's national carrier Air India has already evacuated around 640 Indians from Wuhan in two separate flights.

According to estimates, over 100 Indians are still living in Wuhan. A sizeable number of countries have evacuated their citizens from China and restricted movement of people and goods to and from the country in view of the massive outbreak of coronavirus there.

Indian nationals in Wuhan continue their long wait for the flight. The delay is causing them and their family members in India tremendous mental anguish, said the sources.

They said relief and evacuation flights from other countries including by France are allowed to operate by China but the permission has not come through in India's case.

"Are they not interested in Indian aid provided as our token of support? Why are they creating roadblock in evacuating our nationals from Wuhan and putting them under hardship and mental agony?" said a person aware of the issue.

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.