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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, Jun 13: Ten days after recording two lakh COVID-19 cases, India surpassed the three lakh-mark on Saturday with the worst daily spike of 11,458 infections, while the death toll too climbed to 8,884 with 386 new fatalities, the Union Health Ministry said.

India took 64 days to cross the 1 lakh-mark from 100 cases, then in another fortnight it reached the grim milestone of two lakh cases. It has now become the fourth worst-hit nation by the pandemic with a caseload of 3,08,993, according to coronavirus statistics website Worldometer.

However, the Health Ministry said on Friday the doubling time of coronavirus cases has improved to 17.4 days from 15.4 days. And its data updated at 8 am on Saturday showed active cases at 1,45,779 and those who have recovered at 1,54,329; one patient has migrated.

"Thus, around 49.9 per cent patients have recovered so far," a ministry official said.

The total number of confirmed cases include foreigners.

Of the 386 new deaths, Delhi accounted for the highest 129 fatalities followed by Maharashtra 127. The virus is moving rapidly in Delhi, which for the first time reported over 2,000 cases on Friday, and Maharashtra, where the number of cases has crossed one lakh.

Gujarat reported 30 deaths, Uttar Pradesh 20, Tamil Nadu 18, West Bengal, Telangana and Madhya Pradesh 9 each, Karnataka and Rajasthan 7 each, Haryana and Uttarakhand 6 each, Punjab 4, Assam 2, Kerala, Jammu and Kashmir and Odisha 1 each.

Of the total 8,884 deaths, Maharashtra tops the tally with 3,717 fatalities followed by Gujarat with 1,415, Delhi with 1,214, West Bengal with 451, Madhya Pradesh with 440, Tamil Nadu with 367, Uttar Pradesh with 365, Rajasthan with 272 and Telangana with 174 deaths.

The death toll reached 80 in Andhra Pradesh, 79 in Karnataka, 70 in Haryana and 63 in Punjab. Jammu and Kashmir has reported 53 COVID-19 fatalities, Bihar 36 and Uttarakhand 21, Kerala 19, Odisha 10 and Jharkhand and Assam 8 each.

Chhattisgarh and Himachal Pradesh have registered 6 deaths each, Chandigarh 5, Puducherry 2, while Meghalaya, Tripura and Ladakh 1 each, according to the health ministry.

Maharashtra has reported the maximum number of cases at 1,01,141 followed by Tamil Nadu (40,698), Delhi (36,824), Gujarat (22,527), Uttar Pradesh (12,616), Rajasthan (12,068) and Madhya Pradesh (10,443).

The number of COVID-19 cases has gone up to 10,244 in West Bengal, 6,516 in Karnataka, 6,334 in Haryana and 6,103 in Bihar. It has risen to 5,680 in Andhra Pradesh, 4,730 in Jammu and Kashmir, 4,484 in Telangana and 3,498 in Odisha and Assam each.

Punjab has reported 2,986 cases while Kerala has 2,322 cases.

A total of 1,724 people have been infected by the virus in Uttarakhand, 1,617 in Jharkhand, 1,424 in Chhattisgarh, 961 in Tripura, 486 in Himachal Pradesh, 463 in Goa, 385 from Manipur and 334 in Chandigarh.

Ladakh has registered 239 COVID-19 cases, Puducherry 157, Nagaland 156, Mizoram 104, Arunachal Pradesh 67, Sikkim 63, Meghalaya 44 while Andaman and Nicobar Islands has registered 38 cases.

Dadar and Nagar Haveli and Daman and Diu together have reported 30 cases.

The ministry said 7,984 cases are being reassigned to states and "our figures are being reconciled with the ICMR". State-wise distribution is subject to further verification and reconciliation, it added.

New Delhi, Feb 1: Prime Minister Narendra Modi on Saturday greeted the Indian Coast Guard on its raising day, appreciating its efforts to keep the country's coasts safe.

The Coast Guard came into being in 1977.

"Greetings to the Indian Coast Guard on their foundation day. Our Coast Guard has made a mark due to their remarkable efforts to keep our coasts safe," Modi tweeted.

The prime minister said the force's "concern towards the marine ecosystem is also noteworthy".