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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.

Kochi/Mumbai, Jan 24: Two students who recently returned from China have been kept under medical observation at the Ernakulam Government Medical College here for possible exposure to the coronavirus, an outbreak of which in China has triggered a global health scare.

Reports from Mumbai said two persons there too have been put observation at the civic-run Kasturba Hospital in Chinchpokali, PTI reported.

Health officials said no cases of the deadly infection have been detected.

One of the students being screened in Kerala and both being screen in Mumai have reported symptoms such as cold and fever and has been kept in isolation wards.

The additional district medical officer of Ernakulam, Dr S Sreedevi, said samples of the student’s body fluids would be sent to the National Institute of Virology in Pune for tests.

The youngster consulted a doctor at a private hospital and was referred to the Ernakulam hospital in the wake of the virus outbreak in Wuhan city of China.

A stringent screening system has been set up at the Kochi International Airport to screen passengers who have been in the affected province in China. Persons who have been to Wuhan and showing symptoms of cold, cough and fever are being immediately shifted to the Ernakulam hospital.

All quariantine facilities have been put in place there including an isolation ward and a ventilator.

The other person under observation in Kerala is an MBBS student from Kottayam district who recently returned from his college in China. The district medical office said she has no health issues. She was put under observation as a precautionary measure.

In Mumbai, 1,789 passengers have undergone thermal screening at the Chhatrapati Shivaji Maharaj International Airport for the coronavirus since January 19.

Coronavirus cases were first reported from Wuhan, the capital of central Chinas Hubei province in China.

In the wake of the coronavirus outbreak in China, doctors at international airports have been asked to screen travellers for symptoms if they are returning from China. All private doctors have been asked to alert the authorities if they observe symptoms of the coronavirus.

Kashmir, Jan 9: US Ambassador to India Kenneth I Juster along with envoys from 15 other countries arrived in Srinagar on a two-day visit to Jammu and Kashmir on Thursday, the first visit by diplomats since the abrogation of the erstwhile state's special status in August last year.

The Delhi-based envoys arrived in Srinagar by a special chartered flight at Srinagar's technical airport where top officials from the newly carved out union territory received them, officials said.

Later in the day, they would be going to Jammu, the winter capital of the newly created Union Territory, for an overnight stay. They will meet Lt Governor G C Murmu as well as civil society members, they said.

Besides the US, the delegation will include diplomats from Bangladesh, Vietnam, Norway, Maldives, South Korea, Morocco, and Nigeria, among others.

Brazil's envoy Andre Aranha Correa do Lago was also scheduled to visit Jammu and Kashmir. However, he backed out because of his preoccupation here, the officials said on Wednesday.

Envoys from the European Union (EU) countries are understood to have conveyed that they will visit the union territory on a different date and are also believed to have stressed on meeting the three former chief ministers -- Farooq Abdullah, Omar Abdullah and Mehbooba Mufti -- who are under detention.

Officials said envoys of several countries had requested the government for a visit to Kashmir to get a first-hand account of the situation in the Valley following the August 5 decision to abrogate provisions of Article 370 and bifurcate it into two union territories, Jammu and Kashmir, and Ladakh.

This is the second visit of a foreign delegation to Jammu and Kashmir since August 5. Earlier, Delhi-based think tank International Institute for Non-Aligned Studies, a Delhi-based think tank took 23 EU MPs on a two-day visit to assess the situation in the union territory.

The government had distanced itself from the visit with Minister of State for Home G Kishan Reddy informing Parliament that the European parliamentarians were on a "private visit".