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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, Mar 22: The central government on Sunday decided to suspend all metro train services across the country till March 31 in view of coronavirus outbreak.

In a message to managing directors of all metro train corporations, Union Housing and Urban Affairs Secretary Durga Shanker Mishra said this is being done in continuation of suspending metro services during 'Janta Curfew'.

"In view of the current global pandemic of this Corona Virus & for containing its further spread through inter-personal proximity, it has been decided to close down metro rail services on all operational networks across the country till 31 March 2020," Mishra tweeted.

In another tweet, he said by the act of social distancing, people can protect themselves and their dear ones, and win the fight against COVID-19.

India reported three more coronavirus deaths on Sunday, including the first casualty from Bihar, taking the toll to seven and the number of COVID-19 cases rose to 341, officials said.

Alappuzha, Apr 5: Coming to the rescue of a toddler in need of crucial treatment for cancer, the Kerala health department scrambled its resources for transporting a toddler from here to Hyderabad on Sunday.

In a co-ordinated action, the department arranged for an ambulance and necessary travel permits for the nearly 16-hour 1,100 km inter-state journey that started at 7.15 am from Cherthala in this district with the entire cost to be borne by the state government.

Health Minister K K Shailaja on Saturday said all steps have been taken to facilitate the travel of the toddler and her family members to Hyderabad after local media reports highlighted the plight of the child.

The state Chief Secretary had discussed the matter with his counterparts of other states en route to ensure a smooth journey,the Health Ministry said.

"The travel permit and directions to other states through which the ambulance has to pass were issued from the police headquarters. All district police chiefs were given instructions from the headquarters to arrange for passage of the ambulance," it said in a release.

The journey started at 7.15 am and they are expected to reach Hyderabad at 11 pm.

"The state government will bear the expenses incurred for the journey. The ambulance will remain in Hyderabad and will return with the family," it said.

The first phase of treatment was done at the L V Prasad Hospital in Hyderabad and the family was supposed to travel again within 21 days for the next phase of treatment.

As the family could not undertake the journey in view of the nation-wide lockdown to check coronavirus scare, the state government swung into action to help the child.

The number of confirmed novel coronavirus cases in the country climbed to 3,374 on Sunday while the death toll rose to 77, according to Union Health Ministry data.