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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, Apr 22: Philanthropist and Microsoft co-founder Bill Gates has lauded Prime Minister Narendra Modi's leadership in dealing with COVID-19 pandemic by adopting several measures including lockdown and increasing health expenditure to strengthen the health system response.

"We commend your leadership and the proactive measures you and your government have taken to flatten the curve of the COVID-19 infection rate in India, such as adopting a national lockdown, expanding focused testing to identify hot spots for isolation, quarantining, and care, and significantly increasing health expenditures to strengthen the health system response and promote R&D and digital innovation," Gates wrote.

He added: "I'm glad your government is fully utilising its exceptional digital capabilities in its COVID-19 response and has launched the Aarogya Setu digital app for coronavirus tracking, contact tracing, and to connect people to health services."

Prime Minister Modi had on March 24 announced a 21-day nationwide lockdown as a precautionary measure to contain the spread of COVID-19. The lockdown was later extended to May 3.

Gates further stated, "Grateful to see that you are seeking to balance public health imperatives with the need to ensure adequate social protection for all Indians."

With 1,486 new cases and 49 deaths in the last 24 hours, India's total number of coronavirus positive cases have risen to 20,471 while the death toll stands at 652, Union Ministry of Health and Family Welfare said on Wednesday.

Out of the total number of cases, 15,859 are active cases, 3,959 cured or discharged or migrated and 652 deaths.

Bill Gates met Prime Minister Modi in New Delhi on November 18 last year.

During his visit, Gates had addressed a function organised by NITI Aayog for the release of its report on 'Health Systems for a New India: Building Blocks - Potential Pathways to Reforms' wherein he lauded the country for its healthcare system and talked about how digital tools can help improve it further.

At that time, the philanthropist had commended the Central government for stepping up and eradicating polio.

New Delhi, Jun 20: With the highest single-day increase of 14,516 COVID-19 cases reported in the last 24 hours, India's coronavirus count stood at 3,95,048 on Saturday.

The death toll has gone up to 12,948 in the country with 375 persons succumbing to the infection.

According to the Union Ministry of Health and Family Welfare, the total number of cases includes 1,68,269 active cases, 2,13,831 cured/discharged/migrated and 12,948 deaths.

Maharashtra with 1,24,331 cases continues to be the worst-affected state in the country with 55,665 active cases while 62,773 patients have been cured and discharged in the state so far. The death toll due to COVID-19 stands at 5,893 in the state.

The number of confirmed cases in Tamil Nadu also crossed the 50 thousand mark on Saturday and reached 54,449.

The national capital is the third-worst affected by the infection in the country with the count reaching 53,116 today.