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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 15: With an increase of 11,502 cases in the past 24 hours, the COVID-19 count in India reached 3,32,424 on Monday, according to the Union Health and Family Welfare Ministry.

The spike is marginally lower than the highest-ever spike of 11,929 new cases the country registered a day earlier.

With 325 deaths being reported from across the country, the toll due to COVID-19 has now reached 9,520.

The COVID-19 count includes 1,53,106 active cases while 1,69,798 patients have been cured and discharged or migrated so far.

Maharashtra with 1,07,958 cases continues to be the worst-affected state in the country with 53,030 active cases while 50,978 patients have been cured and discharged in the state so far. 3,950 deaths have been reported due to the infection so far from Maharashtra.

It is followed by Tamil Nadu with 44,661 cases and the national capital with 41,182 confirmed cases.

New Delhi, Jul 18: With 34,884 people testing positive for coronavirus in the last 24 hours, India's Covid-19 caseload surged to 10,38,716 while 6,53,750 patients have recovered from the disease so far, according to data by the Union Health Ministry.

The death toll due to Covid-19 rose to 26,273 with 671 fatalities reported in a day, the data updated at 8 am on Saturday showed.

At present, there are 3,58,692 active cases in the country, while 6,53,750 people have recovered so far and one has migrated.

"Around 62.94 per cent of patients have recovered so far," an official said.

The total number of confirmed cases includes foreigners.

This is the third consecutive day when the number of Covid-19 cases increased by more than 30,000.

According to the Indian Council of Medical Research (ICMR), a cumulative total of 1,34,33,742 samples have been tested for COVID-19 up to July 17 with 3,61,024 samples being tested on Friday.

Of the 671 deaths reported in the last 24 hours, 258 are from Maharashtra, 115 from Karnataka, 79 from Tamil Nadu, 42 from Andhra Pradesh, 38 from Uttar Pradesh, 26 each from West Bengal and Delhi, 17 from Gujarat, nine each from Jammu and Kashmir and Punjab, and eight each from Madhya Pradesh and Rajasthan.

Telangana has reported seven fatalities followed by Haryana with five deaths, Jharkhand, Bihar and Odisha reported four each, Assam and Puducherry have registered three each, Chhattisgarh and Goa reported two each while Kerala and Uttarakhand have registered a fatality each.

Of the total 26,273 deaths reported so far, Maharashtra accounted for the highest 11,452 fatalities followed by Delhi with 3,571 deaths, Tamil Nadu 2,315, Gujarat 2,106, Karnataka 1,147, Uttar Pradesh 1,084, West Bengal 1,049, Madhya Pradesh 697 and Rajasthan 546.

So far 534 people have died of COVID-19 in Andhra Pradesh, 403 in Telangana, 327 in Haryana, 239 in Punjab, 231 in Jammu and Kashmir, 201 in Bihar, 83 in Odisha, 51 in Uttarakhand and Assam each, 46 in Jharkhand and 38 in Kerala.

Puducherry has registered 25 deaths, Chhattisgarh 23, Goa 21, Himachal Pradesh and Chandigarh 11 each, Arunachal Pradesh and Tripura three each, Meghalaya and Dadra and Nagar Haveli and Daman and Diu two each while Ladakh has reported one fatality.

The Health Ministry stressed that more than 70 per cent of the deaths occurred due to comorbidities.

Maharashtra has reported the highest number of cases at 2,92,589 followed by Tamil Nadu at 1,60,907, Delhi at 1,20,107, Karnataka at 55,115, Gujarat at 46,430, Uttar Pradesh at 45,163 and Telangana at 42,496.

The number of Covid-19 cases has gone up to 40,646 in Andhra Pradesh, 38,011 in West Bengal, 27,789 in Rajasthan, 24,797 in Haryana, 23,589 in Bihar and 21,081 in Madhya Pradesh.

Assam has instances of 20,646 infections, Odisha 16,110 and Jammu and Kashmir 12,757 cases. Kerala has reported 11,066 novel coronavirus infections so far, while Punjab has 9,442 cases.

A total of 4,964 have been infected by the virus in Chhattisgarh, 4,921 in Jharkhand, 4,102 in Uttarakhand, 3,304 in Goa, 2,366 in Tripura, 1,832 in Puducherry, 1,800 in Manipur, 1,417 in Himachal Pradesh and 1,151 in Ladakh.

Nagaland has recorded 956 Covid-19 cases, Chandigarh 660, Arunachal Pradesh 609 and Dadra and Nagar Haveli and Daman and Diu together have reported 585 cases.

Meghalaya has reported 403 cases, Mizoram 282, Sikkim has registered 266 infections so far, while Andaman and Nicobar Islands has recorded 194 cases.

"Our figures are being reconciled with the ICMR," the ministry said, adding that 163 cases are being reassigned to states.

State-wise distribution is subject to further verification and reconciliation, it added.