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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.

Mumbai, Feb 6: The Reserve Bank of India, for the second straight time, on Thursday kept its key policy rate unchanged at 5.15 per cent, maintaining its accommodative policy stance as long as it was necessary to revive growth.

The central bank retained GDP growth at 5 per cent for 2019-20 and pegged it at 6 per cent for the next fiscal.

"Economic activity remains subdued and the few indicators that have moved up recently are yet to gain traction in a more broad-based manner. Given the evolving growth-inflation dynamics, the MPC felt it appropriate to maintain status quo,” the Monetary Policy Committee (MPC) said.

The six-member committee voted unanimously to hold rates, but also said that there is “policy space available for further action”.

Between February and October 2019, the RBI had reduced repo rate by 135 basis points.

Thiruvananthapuram, Mar 6: A 12-member team from Telangana on Friday visited Kerala to study how the state contained the spread of novel coronavirus.

Interacting with the team, Kerala Health Minister KK Shailaja said, "The team will be given a presentation at National Health Mission and they will visit Alappuzha district to know how the health facilities are set up by Kerala Health Department on the grassroots level."

"The team comprising doctors and senior health officials will visit the control room set up by the Health Department and also will attend daily review meetings. They will also visit an isolation ward in the hospital and interact with doctors and nurses, " the minister said.

She added, "Kerala model is being followed by other states too. All states are working together and the country as a whole is fighting the coronavirus. They are sharing our experience. All of India is standing together. Contact tracing and isolation is the most important part."

Dr Mahaboob Khan, part of the Telangana team told media persons, that the discussion with the health minister was fruitful.

"Kerala was the first state in India where a positive coronavirus case was reported. All three positive cases reported have been discharged after testing negative. So we wanted to study how Kerala was able to contain it and the health system in place here, " he said.