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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, Jun 15: After Two Indian officials working with Indian High Commission in Pakistan wet missing on Monday,  the Ministry of External Affairs summoned Pakistan's Charge d'affaires to India in the national capital and told them not to interrogate or harass Indian officials.

"Two Indian High Commission officials are missing since morning while on official work. The matter has been taken up with the Pakistani authorities," Akhilesh Singh, First Secretary and spokesperson, Indian High Commission, Pakistan, said.

According to sources quoted by PTI news agency, the MEA told the  Pakistan's Charge d'affaires to India that the responsibility of safety and security of Indian personnel in Islamabad "lays squarely with Pakistani authorities."

"Pakistan was asked to ensure return of two Indian officials along with official car to Indian High Commission in Islamabad immediately," sources added. 

The incident comes after two Pakistani officials at the Pakistani High Commission in New Delhi were accused of espionage and deported.

The two officials have been missing since Monday morning. Officials said the issue has been taken up with the Pakistan government.

Earlier, a vehicle of India's Charge d'affaires Gaurav Ahluwalia was chased by Inter-Services Intelligence (ISI) member.

In March, the Indian High Commission in Pakistan sent a strong protest note to the foreign ministry in Islamabad protesting against the continuing harassment of its officers and staff by Pakistani agencies.

Lucknow, Jan 21: Defending his brainchild, the Citizenship Amendment Act (CAA), Union home minister Amit Shah on Tuesday said the new law will not be scrapped despite the countrywide protests against it.

Addressing a rally here to drum up support for the CAA, Shah also declared that construction of a Ram temple "touching the skies" in Ayodhya will begin within three months.

He said there is no provision in the amended law for taking anyone's citizenship away. "A canard is being spread against the CAA by the Congress, SP, BSP, and Trinamool Congress. The CAA is a law to grant citizenship," he added.

"I want to say that irrespective of the protests this will not be withdrawn," he added.

Shah challenged Congress leaders to hold a discussion with him on CAA at a public forum.

He named Congress leader Rahul Gandhi, Samajwadi Party's Akhilesh Yadav, Bahujan Samaj Party's Mayawati and TMC chief Mamata Banerjee while throwing the "challenge".

Congress has become blind due to vote bank politics,"he said. He also blamed the Congress for Partition.