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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.

Google on Friday announced the launch of a new feature on Google Search, Assistant, and Maps for users in India to help them find information on COVID-19 testing centres near them.

The search giant has partnered with the Indian Council of Medical Research (ICMR) and MyGov to provide the information on authorised testing labs.

The feature is currently available in English and eight Indian languages including Hindi, Telugu, Tamil, Malayalam, Kannada, Bengali, Gujarati, and Marathi.

According to the company, users will now see a new "Testing" tab on the search result page providing a list of nearby testing labs along with key information and guidance needed before using their services.

On Google Maps, when users search for keywords like "COVID testing" or "coronavirus testing" they will see a list of nearby testing labs, with a link to Google Search for the government-mandated requirements.

Google said that the Search, Assistant, and Maps currently feature 700 testing labs across 300 cities and working with authorities to identify and add more testing labs located across the country.

The company reiterates that it is important to follow the recommended guidelines that help determine testing eligibility before visiting.

Lucknow, Jan 16: The drive initiated by Uttar Pradesh's Yogi Adityanath government to identify non-Muslim immigrants in the state seems to have run into rough weather.

In Pilibhit, where the maximum number of about 35,000 illegal immigrants has been identified, it has now been found that information is being sought by the state government on an unverified document. A large number of families from Bangladesh settled here several decades ago.

The survey began last month even before the bill was notified. Moreover, the feedback email on the questionnaire is a Gmail ID -- [email protected] -- which is not a government server.

It is not known how the state government is drawing up the lists without having the verification criteria.

After the report was put up by a news website, Home Department officials feigned complete ignorance about the issue.

A spokesman said: "This was an unofficial and preliminary exercise to assess the number of illegal migrants in the state. The document is meant to collect basic beneficiary information. No list of potential beneficiaries has yet been sent to Delhi."

The document has eight columns asking for name, father's name, place of stay in India, and where did they come from and when. It does not mention any requirement of proof, or documents.

It also asks for a description of the kind of atrocities they faced, presumably in their home country.

The District Magistrate of Pilibhit claimed they are checking documents of the refugees, but denied any knowledge of the unsigned document.

The CAA is meant to benefit Hindus, Sikhs, Buddhists, Jains, Parsis and Christians from Pakistan, Bangladesh and Afghanistan who came to India before December 31, 2014. The statement of purposes of the Act adds that it is meant to benefit those fleeing religious persecution from the above countries.