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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, Jan 31: Slamming the BJP over the Jamia firing incident, Congress leader Priyanka Gandhi Vadra on Friday said such incidents were possible with the ruling party's leaders inciting people to shoot, and asked Prime minister Narendra Modi to answer whether he stands with violence or non-violence.   

Her attack on the government comes a day after tensions in the Jamia area spiralled on Thursday after a man fired a pistol at a group of anti-CAA protesters, injuring a student, before walking away while waving the firearm above his head and shouting "Yeh lo aazadi" amid heavy police presence in the area.

"When the BJP government ministers and party leaders incite people to shoot, give provocative speeches, then all this becomes possible. The Prime Minister should answer what kind of a Delhi he wants to build?" Priyanka Gandhi said in a tweet in Hindi.

Does the PM stand with violence or non-violence, she asked.

"Does he stand with development or with anarchy?" the Congress general secretary said.

New Delhi, Jun 17: Petrol and diesel prices were increased in metros on Wednesday, marking the eleventh straight day of increase since state-owned oil companies returned to the normal practice of daily reviews following a 12-week pause. With effect from 6 am, the price of petrol was increased by 55 paise per litre, and diesel by 69 paise per litre in Delhi, compared to the previous day. While the price of petrol was revised to Rs 77.28 per litre in the national capital from Rs 76.73 per litre the previous day, the diesel rate was increased to Rs 75.79 per litre from Rs 75.19 per litre, according to notifications from state-run Indian Oil Corporation, the country's largest fuel retailer. In the 11-day period, the price of petrol has been increased by a cumulative Rs 6.02 per litre, and diesel by Rs 6.49 per litre.

International crude oil prices retreated on Wednesday, weighed down by an increase in US crude inventories and worries about a potential second wave of the coronavirus pandemic. Brent crude futures - the global benchmark for crude oil - were last seen trading 1.0 per cent lower at $40.56 per barrel.

State-run oil marketing companies revise the prices of petrol and diesel from time to time, besides aviation turbine fuel (ATF) - or jet fuel - and liquefied petroleum gas (LPG). However, since March 16, the oil companies had kept petrol and diesel prices on hold, possibly due to the volatility in global oil markets.

Fuel retailing in the country is dominated by state refiners - Indian Oil Corporation, Bharat Petroleum Corporation and Hindustan Petroleum Corporation. The three own about 90 per cent of the retail fuel outlets in the country.