'Want to congratulate PM on winning world famous award'

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.

Beijing, Mar 21: China reported no domestically transmitted coronavirus cases for the third consecutive day even as seven more fatalities have been confirmed, taking the death toll in the country to 3255.

No new domestically transmitted cases of COVID-19 were reported on the Chinese mainland for the third day in a row on Friday, China's National Health Commission (NHC) said on Saturday.

The overall confirmed cases on the mainland had reached 81,008 by the end of Friday, which included 3,255 who died, 6,013 patients still undergoing treatment, 71,740 patients who had been discharged after recovery, the NHC said.

The NHC said 41 new confirmed COVID-19 cases were reported on the Chinese mainland on Friday from the people arriving from abroad, taking the total number of imported cases to 269.

New Delhi, May 19: The number of coronavirus cases crossed the one lakh mark in the country on Tuesday, while the death toll due to the infection touched 3,163, according to the Union Health Ministry.

A total of 134 deaths and 4,970 COVID-19 cases were reported in the country in the past 24 hours since 8 pm on Monday, it said.

The total number of coronavirus cases has risen to 1,01,139, the ministry said.

The number of active COVID-19 cases stood at 58,802 while 39,173 people have recovered and one patient has migrated, it said.

"Thus, around 38.73 per cent patients have recovered so far," a senior health ministry official said.

The total confirmed cases include foreigners.

Of the 134 deaths reported since Monday morning, 51 were in Maharashtra, 35 in Gujarat, 14 in Uttar Pradesh, eight in Delhi, seven in Rajasthan, six in West Bengal, four in Madhya Pradesh, three in Tamil Nadu, two each in Punjab and Jammu and Kashmir, and one each in Bihar and Telangana.

Of the 3,163 fatalities, Maharashtra tops tally with 1,249 deaths. Gujarat comes second with 694 deaths, followed by Madhya Pradesh at 252, West Bengal at 244, Delhi at 168, Rajasthan at 138, Uttar Pradesh at 118, Tamil Nadu at 81 and Andhra Pradesh at 50.

The death toll reached 37 each in Karnataka and Punjab and 35 in Telangana.

Jammu and Kashmir has reported 15 fatalities due to the disease, Haryana has 14 deaths while Bihar has registered nine and Kerala and Odisha each have reported four deaths.

Jharkhand, Chandigarh and Himachal Pradesh each have recorded three COVID-19 fatalities, while Assam has reported two deaths.

 Meghalaya, Uttarakhand and Puducherry have reported one fatality each, according to the data provided by the ministry.

According to the ministry's website, more than 70 per cent of the deaths are due to comorbidities, the existence of multiple disorders in the same person.

According to the health ministry's data updated in the morning, the highest number of confirmed cases in the country are from Maharashtra at 35,058, followed by Tamil Nadu at 11,760, Gujarat at 11,745, Delhi at 10,054, Rajasthan at 5,507, Madhya Pradesh at 5,236 and Uttar Pradesh at 4,605.

The number of COVID-19 cases has gone up to 2,825 in West Bengal, 2,474 in Andhra Pradesh and 1,980 in Punjab.

It has risen to 1,597 in Telangana, 1,391 in Bihar, 1,289 in Jammu and Kashmir, 1,246 in Karnataka and 928 in Haryana.

Odisha has reported 876 coronavirus infection cases so far, while Kerala has 630 cases. A total of 223 people have been infected with the virus in Jharkhand and 196 in Chandigarh.

Tripura has reported 167 cases, Assam has 107, Uttarakhand and Chhattisgarh have 93 cases each, Himachal Pradesh has 90 and Ladakh has registered 43 cases so far.

Goa has reported 38 COVID-19 cases, while the Andaman and Nicobar Islands has registered 33 infections.

Puducherry has registered 18 cases, Meghalaya has 13 and Manipur has seven cases. Mizoram, Arunachal Pradesh and Dadar and Nagar Haveli have reported a case each till how.

"814 cases are being reassigned to states," the ministry said on its website, adding "our figures are being reconciled with the ICMR".

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