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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, Jul 1: Jet fuel or ATF price on Wednesday was hiked by 7.5 per cent, the third increase in a month, while petrol and diesel rates were unchanged for the second day in a row.

Aviation turbine fuel (ATF) price was hiked by Rs 2,922.94 per kilolitre (kl), or 7.48 per cent, to Rs 41,992.81 per kl in the national capital, according to a price notification by state-owned oil marketing companies.

This is the third straight increase in ATF prices in a month. Rates were hiked by a record 56.6 per cent (Rs 12,126.75 per kl) on June 1, followed by Rs 5,494.5 per kl (16.3 per cent) increase on June 16.

Simultaneously, non-subsidised cooking gas LPG rates were increased by Re 1 to Rs 594 per 14.2-kg cylinder in the national capital. Prices were up by Rs 4 in other metros mostly because of different local sales tax or VAT rate.

On the other hand, petrol and diesel prices were unchanged for the second day in a row.

This, after diesel rates scaled a new high after prices were hiked 22 times in just over three weeks.

In Delhi, a litre of petrol comes for Rs 80.43 per litre, while diesel is priced at Rs 80.53 per litre.

Rates vary from state to state depending on the incidence of local sales tax or VAT.

While the diesel price had been hiked on 22 occasions since June 7, petrol price had been raised on 21 occasions.

The cumulative increase since the oil companies started the cycle on June 7 totals to Rs 9.17 for petrol and Rs 11.14 for diesel.

Mar 18: Madhya Pradesh Congress Party sought in the Supreme Court on Wednesday that the trust vote in the state assembly be deferred till by-polls for the vacant seats are concluded, saying "heavens are not going to fall" if its government led by Kamal Nath is allowed to remain in office till then.

A bench, comprising Justices D Y Chandrachud and Hemant Gupta, was hearing cross petitions filed by former Madhya Pradesh Chief Minister and senior BJP leader Shivraj Singh Chouhan and MP Congress on the ongoing political crisis in the state after 22 rebel MLAs of the ruling combine purportedly offered to resign.

"Heavens are not going to fall if Congress government is allowed to continue till by-polls and the Shivraj Singh Chouhan's government must not be saddled on the people," said senior advocate Dushyant Dave, appearing for Congress.

"Let them face re-elections and then hold trust vote... You (BJP) have engineered it. My petition raises the frontal attack that you have launched a conspiracy," he said.

Senior advocate Mukul Rohatgi, appearing for Chouhan, vociferously opposed the submission saying that the party which killed the democracy by imposing emergency in 1975 is now referring to "lofty ideals" of B R Ambedkar.

He said that after the resignations of 22 Congress MLAs, out of which six resignations have been accepted, the state government should not be allowed to continue even for a day.

"It is lust of power because of which all these lofty arguments are being made.

"It is unheard of that a person who had lost majority says that he wants to continue for six months and there should be re-election before the trust vote.

Rohatgi said the Kamal Nath government wanted to stay in power by hook or crook.

Earlier in the day, the Madhya Pradesh Congress told the bench that a probe is needed on the resignation letters of its rebel MLAs that have been submitted by BJP leaders to the Speaker of the state Assembly.

Dave said the Governor has no business to send messages at night asking the Chief Minister or Speaker to hold floor test.

"The Speaker is the ultimate master and the Madhya Pradesh Governor is overriding him," he said.

The party alleged that resignations of its rebel MLAs were extracted by force and coercion and they did not act as per their free will.

It also said that its rebel MLAs were taken away in chartered flights and are currently incommunicado in a resort arranged by the BJP.

The advancing of arguments will resume after lunch.

The Madhya Pradesh Congress Legislature party (MPCLP) had Tuesday moved the Supreme Court seeking direction to the Centre and the BJP-led Karnataka government to grant it access to communicate with its rebel MLAs allegedly kept at Bengaluru.

Earlier on Tuesday, the court had asked the Kamal Nath government in the state earlier in the day to respond by Wednesday to a plea by senior BJP leader Shivraj Singh Chouhan seeking immediate floor test in the Assembly.

MPCLP, in its plea filed by Govind Singh, an MLA and chief whip of Congress legislature party, urged the apex court to declare as illegal the action of the Centre, Karnataka government and the MP BJP of illegally confining its MLAs in Bangaluru.

The plea, filed through senior lawyer Devdutt Kamat, said the trust vote would be a "sham" if 22 MLAs did not take part in it as almost 10 per cent of constituencies go unrepresented.

The plea filed by Chouhan and nine BJP lawmakers was moved in the top court just after the Speaker cited coronavirus concerns and adjourned the House till March 26 without taking the floor test apparently defying the directions of Governor Lalji Tandon.

The plea alleged that the Speaker, the Chief Minister and the Principal Secretary of the Assembly have "flagrantly violated the constitutional principles and have deliberately and wilfully defied the directions" issued by the governor asking the government to prove the majority on the floor of the house on March 16 when when the budget session was to commence.

On Saturday night, Tandon wrote to Nath asking him to seek a trust vote in the Assembly soon after the Governor's address on Monday, saying his government was in minority.

After the Speaker accepted the resignation of six Congress MLAs on Saturday, the party now has 108 legislators.

These include 16 rebel legislators who have also put in their papers but their resignations are yet to be accepted.

The BJP has 107 seats in the House, which now has an effective strength of 222, with the majority mark being 112.