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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.

Visakhapatnam, May 7: Unconscious children being carried by parents in their arms, people laying on roads, health workers scrambling to attend to those affected by the styrene vapour leak and residents fleeing were some of the scenes that played out near here on Thursday, bringing back grim memories of the 1984 Bhopal gas tragedy.

The leak of styrene, a chemical used to make synthetic rubber and resins, among others, occurred in the wee hours of Thursday while people were still fast asleep.

Women and children were seen lying on roads struggling to breath, reminiscent of the infamous Bhopal gas tragedy when a leak from the Union Carbide plant left around 3,500 dead and many maimed.

The worst-hit Gopalapatnam village reverberated with cries of people for help.

Many people fell unconscious during their sleep, a villager said.

Affected people, suffering writ large on their faces, were rushed to hospitals in autorickshaws and on two wheelers.

Visakhapatnam Collector Vinay Chand said 20 ambulances were pressed into service as soon information about the gas leak was received.

Exposure to styrene, also known as ethenylbenzene, vinylbenzene can affect the central nervous system (CNS), causing headache, fatigue, weakness, and depression.

It is primarily used in the production of polystyrene plastics and resins.

The gas leak took place at LG Polymers chemical plant.

LG Polymers was established in 1961 as "Hindustan Polymers" for manufacturing Polystyrene and its co-polymers at Visakhapatnam. It merged with McDowell & Co. Ltd of UB Group in 1978, according to the company's website.

Taken over by LG Chem (South Korea), Hindustan Polymers was renamed LG Polymers India Private Limited (LGPI) in July, 1997.

New Delhi, Jan 10: An IPS officer's thumb was bitten by a woman protester when he was pushing back agitators, who were trying to march towards the Rashtrapati Bhawan here on Thursday, police sources said.

The protesters had gathered after a call was given by JNU Students' Union president Aishe Ghosh to march towards President's House to demand the removal of University's Vice Chancellor, M Jagadesh Kumar.

Ingit Pratap Singh, a 2011 batch officer, who is currently posted as the additional deputy commissioner of the southwest district, was injured in the attack.

According to sources, Singh was trying to pull a male protester when the woman, in a bid to shield her friend, bit Singh's left thumb.