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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.

Several India-based firms are spoofing the World Health Organisation (WHO) by creating fake Gmail accounts and luring business leaders in disguise of informing them of latest COVID-19 announcements and hack their personal and financial information, Google has warned.

These "hack-for-hire" firms, many based in India, have been creating Gmail accounts spoofing the WHO, largely targeting business leaders in financial services, consulting, and healthcare corporations within numerous countries including, the US, Slovenia, Canada, India, Bahrain, Cyprus, and the UK.

"The lures themselves encourage individuals to sign up for direct notifications from the WHO to stay informed of COVID-19 related announcements, and link to attacker-hosted websites that bear a strong resemblance to the official WHO website," security researchers from Google's Threat Analysis Group said on Wednesday.

The sites typically feature fake login pages that prompt potential victims to give up their Google account credentials, and occasionally encourage individuals to give up other personal information, such as their phone numbers.

On any given day, Google's Threat Analysis Group (TAG) said it is tracking more than 270 targeted or government-backed attacker groups from more than 50 countries.

Last month, it sent 1,755 warnings to users whose accounts were targets of government-backed attackers.

"Our team of analysts and security experts is focused on identifying and stopping issues like phishing campaigns, zero-day vulnerabilities and hacking against Google, our products and our users," said the tech giant.

Google continues to see attacks from groups like Charming Kitten on medical and healthcare professionals, including WHO employees.

"We're seeing a resurgence in COVID-related hacking and phishing attempts from numerous commercial and government-backed attackers," said the company.

Government-backed or state-sponsored groups have different goals in carrying out their attacks: Some are looking to collect intelligence or steal intellectual property; others are targeting dissidents or activists, or attempting to engage in coordinated influence operations and disinformation campaigns.

Google said that since March, it has removed more than 1,000 YouTube channels that were part of a large campaign and behaving in a coordinated manner.

"These channels were mostly uploading spammy, non-political content, but a small subset posted primarily Chinese-language political content similar to the findings of a recent Graphika report," said the company.

Several cybersecurity firms have seen a spike in COVID-19 related scams and hacking attempts. Hackers are also creating scam sites similar to COVID-19 relief packages.

Researchers at Check Point Software Technologies revealed in mid-May that they have seen 192,000 coronavirus-related cyber-attacks per week over the past three weeks, a 30 % increase compared to previous weeks.