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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, Mar 29: The battle against coronavirus is a tough one and it required harsh decisions to keep India safe, said Prime Minister Narendra Modi in his first Mann Ki Baat after the 21-day lockdown was imposed in the wake of COVID-19 outbreak.
"The battle against COVID-19 is a tough one and it did require such harsh decisions. It is important to keep the people of India safe. A disease must be dealt with at the very beginning as delay makes it incurable," said Prime Minister Modi.
He said that as the coronavirus has put the entire world in lockdown, so "India is doing the same."
"It is a challenge before everyone, science and knowledge, poor and rich, powerful and weak. It is neither restricted to a nation nor region or particular weather. This virus is bent upon killing human beings, eliminating them. Hence all of us, the entire humanity, must unite and resolve to eliminate it," he added.
Addressing the 63rd edition of his monthly radio programme 'Mann Ki Baat', the Prime Minister had sought forgiveness from all countrymen, and especially the poor, for the nationwide lockdown in the country in the view of the novel coronavirus.
During his address to the nation on March 24, the Prime Minister had announced a 21-day nationwide lockdown to contain the spread of the deadly virus. 

New Delhi, Apr 7: The death toll due to novel coronavirus rose to 114 and the number of cases in the country climbed to 4,421 on Tuesday, according to the Union Health Ministry.

While the number of active COVID-19 cases stood at 3,981, as many as 325 people were cured and discharged, and one had migrated, it stated. The total number of cases include 66 foreign nationals.

According to the ministry's data updated at 9 am, three new deaths were reported from Rajasthan, while Tripura recorded its first coronavirus case.

Maharashtra has reported the most coronavirus deaths at 45, followed by Gujarat at 12, Madhya Pradesh nine, Telangana and Delhi seven each, Punjab six and Tamil Nadu five fatalities.

Karnataka registered four deaths, while West Bengal, Uttar Pradesh, Andhra Pradesh and Rajasthan have recorded three fatalities each. Two deaths each have been reported from Jammu and Kashmir and Kerala. Bihar, Himachal Pradesh and Haryana have reported one fatality each, according to the health ministry data.

However, a PTI tally based on figures reported by states directly on Monday night showed at least 138 deaths across the country, while the confirmed cases reached 4,683. Of them, 359 have been cured and discharged.

There has been a lag in the Union Health Ministry figures, compared to the numbers announced by different states, which officials attribute to procedural delays in assigning the cases to individual states.

The highest number of confirmed cases are from Maharashtra at 748, followed by Tamil Nadu at 621 and Delhi with 523 cases. Kerala reported 327 COVID-19 cases, Telangana 321, Uttar Pradesh 305 and Rajasthan 288 cases. Andhra Pradesh reported 226 coronavirus cases.

Novel coronavirus cases have risen to 165 in Madhya Pradesh, 151 in Karnataka and 144 in Gujarat. Jammu and Kashmir has 109 cases, West Bengal has 91, Haryana 90 and Punjab 76 cases of the infection.

Thirty-two people were infected with the virus in Bihar while Uttarakhand has 31 patients and Assam 26. Odisha reported 21 coronavirus cases, Chandigarh 18, Ladakh 14 and Himachal Pradesh 13 cases.

Ten cases each have been reported from the Andaman and Nicobar Islands and Chhattisgarh. Goa has reported seven COVID-19 infections, followed by Puducherry with five cases. Jharkhand has reported four cases and Manipur two. Tripura, Mizoram and Arunachal Pradesh have reported one case of the infection each.

"State-wise distribution is subject to further verification and reconciliation," the ministry said on its website.