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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.

Amaravati, Apr 1: All the 43 patients who were tested positive for COVID-19 in Andhra Pradesh on Wednesday have returned after attending the event at Delhi's Nizamuddin Markaz, said Chief Minister's Office, Andhra Pradesh.

With 43 new COVID-19 positive cases, the total number of coronavirus cases in Andhra Pradesh has reached 87, informed the state Nodal Office earlier today.

The 43 new coronavirus positive cases were reported between March 31, 9 pm and April 1, 9 am. A total of 373 samples were tested during this time period and of these samples, 330 were negative and 43 came out to be positive.

There has been an increase of 240 COVID-19 cases in the last 12 hours across the country.
According to the Ministry of Health and Family Welfare, the total number of COVID-19 positive cases have reached 1637 in India, including 1466 active cases, 133 cured/discharged/migrated people and 38 deaths.

New Delhi, Jun 6: Bookings for select destinations in the USA, Canada, UK and Europe etc under Phase3 of Mission Vande Bharat opened at 5 pm on Friday, according to Air India.

"#FlyAI: Bookings for select destinations in USA, Canada, UK & Europe etc under Phase3 of #MissionVandeBharat opened at 5pm today. Around 60 million hits received till 7pm on our website & 1700 seats sold through website alone in 2 hrs. Bookings continue & tickets are being issued," the national carrier said in a tweet on Friday.

The third phase of the mission will begin from June 11 and continue till June 30.

Air India will operate five flights in the third phase of Vande Bharat Mission to evacuate almost 1,200 Indians nationals stranded in the United Kingdom between June 18 to June 23.

Air India will operate 70 flights in the third phase of Mission Vande Bharat to evacuate Indians stranded in the US and Canada between June 11 to June 30, Civil Aviation Minister Hardeep Singh Puri had said.