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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.

Jaipur, Mar 29: A batch of 275 Indians evacuated from coronavirus-hit Iran arrived at the Jodhpur airport on Sunday morning, an official said.

He said a preliminary screening of the passengers was conducted at the airport and thereafter, they were shifted to the Army Wellness Facility set up at the Jodhpur Military Station.

Additional Chief Secretary (Health) Rohit Kumar Singh said of the 275 passengers, there were 133 women and 142 men, including two infants and four children.

Kochi, Jan 22: The Left front government in Kerala on Monday decided to inform the Centre it would not cooperate with the updation of the NPR, saying there were fears among the public about the process and it has the "Constitutional responsibility" to alleviate them and ensure law and order.

A special cabinet meeting, chaired by Chief Minister Pinarayi Vijayan here, decided to inform the Registrar General and Census Commissioner under the Union Home Ministry that it was unable to cooperate with anything with regard to the updation of the NPR.

"The decision was taken as it was the Constitutional responsibility of the government to alleviate the fears of general public and ensure law and order situation in the state," a Chief Minister's Office release said.

However, the state would fully cooperate with the census procedures, it said.

The LDF government, which has been on a warpath against the Centre over the Citizenship Amendment Act, has last month stayed all activities related to updation of NPR, considering 'apprehensions' of public that it would lead to NRC in the wake of the controversial CAA.

"As the NPR is a process that leads to the National Register of Citizens (NRC), there is a sense of fear among the people that its implementation could lead to widespread insecurity", the CMO release said on Monday.

The experience of the state which had already compiled the NRC was an example for this, it added, in apparent reference to Assam.

Kerala had already stopped all procedures regarding the NPR updation, the release said adding there was also a report of the state police that the if the government went ahead with the procedures, it would adversely impact the law and order situation.

The district collectors have also informed the government that the Census procedures would be affected if the updation of the NPR was done along with it, the CMO release said.

The CPI(M)-led LDF government had recently convened a meeting of political parties and socio-religious organisations here on December 29 in the wake of the concerns among people in various stratas of the society, it said.

A special assembly session was convened and a resolution was passed requesting the Centre not to implement the CAA and the government had also approached the apex court against the law, it added.