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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 17: AAP MLA and national spokesperson Atishi has tested positive for COVID-19, her party colleagues said on Wednesday.

Delhi Chief Minister Arvind Kejriwal took to Twitter to wish her speedy recovery.

"Atishi ji has played an important role in the fight against corona. I hope that she will get healthy soon and again get involved in serving the people," Kejriwal tweeted in Hindi.

According to sources, Atishi was tested on Tuesday for COVID-19 and her report came positive today.

She is presently under home quarantine, the sources said.

"Get well soon Atishi, recover soon from Corona," AAP MLA Saurabh Bhardwaj tweeted.

Atishi represents Kalkaji assembly constituency.

New Delhi, Mar 11: A doctor in Kerala on Tuesday alleged that she was sacked by the management of the private clinic she was working with for informing authorities about a non-resident Indian (NRI) patient who reportedly declined to undergo the mandatory check for coronavirus.

Dr Shinu Syamalan said the patient had come to the clinic recently with suspected symptoms of the virus.

"When he was asked whether he had visited any foreign countries, he said he was coming from Qatar. But he had not reported to the Health department about his foreign trip," she said.

When he was directed to inform about his foreign travel to the state Health Department, which has been monitoring people coming from abroad for the virus, he refused and said he was going back to Qatar, she told reporters.

Concerned over the health of the person who had high fever, Ms Syamalan informed health and police authorities.

"Officials who let the patient go abroad do not have any problem, but I have become jobless," she posted on social media.

She alleged she was sacked by the management of the clinic for reporting the matter to police and informing the public about the incident through social media and through television.

"The argument of the management is that no one would turn up for treatment in the clinic if they come to know that it was visited by patients with suspected symptoms of Coronavirus," she said.

There was no immediate reaction from the management of the private health clinic.

Official sources said the District Medical Officer (DMO) at Thrissur has complained to the collector against Shinu Syamalan accusing her of defaming health officials.