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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 14: India's COVID-19 tally breached the 9 lakh mark as 28,498 new coronavirus cases were reported in the last 24 hours, informed the Union Ministry of Health and Family Welfare on Tuesday.

As per the Health Ministry, there are a total of 9,06,752 coronavirus cases in the country of which 3,11,565 patients are active cases.

5,71,459 patients have been cured/discharged while one patient has been migrated, the Ministry informed further.

553 more deaths due to COVID-19 were reported in the last 24 hours in the country, taking the number of patients succumbing to the virus to 23,727.

The Centre further informed that India's recovery rate from COVID-19 stands at 63.02 per cent while the recoveries and deaths ratio stood at 96.01 per cent and 3.99 per cent respectively.

As per the Ministry, Maharashtra -- the worst-affected state from the infection -- has a total of 2,60,924 COVID-19 cases and 10,482 fatalities. While Tamil Nadu has a tally of 1,42,798 cases and 2,032 deaths due to COVID-19.

Delhi has reported a total of 1,13,740 cases and 3,411 deaths due to COVID-19.

As per the information provided by the Indian Council of Medical Research (ICMR) 1,20,92,503 samples have been tested for COVID-19 till July 13, of these 2,86,247 samples were tested on Monday.

Thiruvananthapuram, Apr 24: The month of Ramzan will be observed from Friday in Kerala.
The crescent moon was seen at Kappad beach in Kozhikode on Thursday.

Amid nationwide lockdown in the wake of COVID-19, there will be no group prayers at mosques. The devotees have been directed to offer prayers at homes.

Palayam Mosque Imam, VP Suhaib said, "Usually at mosques in Thiruvananthapuram, devotees used to come to break the fast... But this year, amid lockdown, we direct people to prepare food at home and break the fast with family. Also, there will not be group prayers at mosques. People should pray at home."
"Imams and scholars have strictly directed people to observe all Ramzan-related prayers at home. There is no other option... Human life is the most important thing. Only if life exists, belief and religion can exist," he added.

Prime Minister Narendra Modi had on March 24 announced a 21-day nationwide lockdown as a precautionary measure to contain the spread of COVID-19. Later, the lockdown was extended till May 3.