Cartoonist Aseem Trivedi released from Mumbai jail

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 20: Prime Minister Narendra Modi on Monday appealed to state governments to ensure that rules and regulations of the coronavirus lockdown are enforced as he noted that many people are not taking the measure seriously.

"Many people are still not taking the lockdown seriously. Please save yourself, save your family, follow the instructions seriously. I request state governments to ensure rules and laws are followed," he said in a tweet in Hindi.

The Centre and state governments have decided to completely lock down 80 districts across the country where coronavirus cases have been reported.

Uttar Pradesh, Maharashtra, Punjab, Karnataka, Tamil Nadu and Kerala announced lockdown in many districts.

Delhi will be locked down from 6 am on March 23 till midnight on March 31.

New Delhi, Jun 11: The death toll due to COVID-19 rose to 8,102 and the number of cases climbed to 2,86,579 in the country after it registered the highest single-day spike of 357 fatalities and 9,996 cases till Thursday 8 AM, according to the Union Health Ministry data.

The number of recoveries remained more than the active novel coronavirus cases for the second consecutive day.

The number of active cases stands at 1,37,448 while 1,41,028 people have recovered and one patient has migrated to another country, as per the data.   

"Thus, around 49.21 per cent patients have recovered so far," an official said.

The total number of confirmed cases include foreigners.

Of the 357 new deaths reported till Thursday morning, 149 were in Maharashtra, 79 in Delhi, 34 in Gujarat, 20 in Uttar Pradesh, 19 in Tamil Nadu, 17 in West Bengal, eight in Telangana, seven each in Madhya Pradesh and Haryana, four in Rajasthan, three each in Jammu and Kashmir and Karnataka, two each in Kerala and Uttarakhand, one each in Andhra Pradesh, Bihar and Himachal Pradesh.

Out of the total 8,102 fatalities, Maharashtra tops the tally with 3,438 deaths followed by Gujarat with 1,347 deaths, Delhi with 984, Madhya Pradesh with 427, West Bengal with 432, Tamil Nadu with 326, Uttar Pradesh with 321, Rajasthan with 259 and Telangana with 156 deaths.

The death toll reached 78 in Andhra Pradesh, 69 in Karnataka and 55 in Punjab. Jammu and Kashmir has reported 51 fatalities due to the coronavirus disease, while 52 deaths have been reported from Haryana, 33 from Bihar, 18 from Kerala, 15 from Uttarakhand, nine from Odisha and eight from Jharkhand.

Chhattisgarh and Himachal Pradesh have registered six COVID-19 fatalities each, Chandigarh has five while Assam has recorded four deaths so far. Meghalaya, Tripura and Ladakh have reported one COVID-19 fatality each, according to the ministry's data.

More than 70 per cent of the deaths are due to comorbidities, the ministry's website stated.