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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, April 3: The total number of coronavirus cases in India on Friday climbed to 2301, including 156 cured and discharged and 56 deaths, said the Ministry of Health and Family Welfare.

At present, there are 2088 COVID-19 active cases in the country.

"A total number of COVID-19 positive cases rises to 2301 in India, including 156 cured/discharged, 56 deaths and 1 migrated," said the Health Department.

The highest number of positive cases of coronavirus was reported from Maharashtra at 335, including 16 deaths, followed by Tamil Nadu (309 and 6 deaths) and Kerala (286 and 2 deaths).

There are 219 coronavirus positive cases in the national capital, including 8 cured and discharged and 4 deaths.

The states which have crossed 100-mark for COVID-19 positive cases also include Andhra Pradesh (132), Karnataka (124), Rajasthan (133) and Telangana (107).

While 18 people were detected positive for coronavirus in Chandigarh, 70 cases were confirmed from Jammu and Kashmir and 14 from Ladakh.

In North-East, one COVID-19 case each has been confirmed from Mizoram and Assam, and two in Manipur.

New Delhi, Apr 8: The Supreme Court on Wednesday suggested that all tests to identify coronavirus positive patients should be conducted free of cost and asked the Central government to look into creating a mechanism for providing reimbursement for the same.

A bench headed by Justice Ashok Bhushan, while hearing a PIL via video-conferencing, suggested that the test should be conducted free of cost in the identified private laboratories and said that the court will pass appropriate order on the matter.

The apex court was hearing a PIL filed by lawyer and petitioner Shashank Deo Sudhi seeking direction to the Centre and other respective authorities to provide free of cost the testing facility for COVID-19 to all citizens in the country.

Solicitor General Tushar Mehta submitted that 118 laboratories were doing 15,000 test capacity per day and added that 47 private laboratory chains have also been involved for the same.

During the hearing, the court asked the Centre to ensure private labs don't charge a high amount for the test and suggested that the government can create an effective mechanism for reimbursement from the government for tests.

Mehta said that they will look into the suggestion and will try to devise what can be done best.

Sudhi, on the other hand, submitted that testing of coronavirus is very expensive and therefore the Central government should take all necessary steps to provide free of cost the testing facility for COVID-19 kits and others to all citizens in the country.