PM Modi to feature in Discovery's 'Man vs Wild' with Bear Grylls

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 10: A military transport aircraft of the Indian Air Force (IAF) brought back 58 Indians from coronavirus-hit Iran on Tuesday, official said.

The aircraft, a C-17 Globemaster, was sent to Tehran on Monday evening.

About 2,000 Indians are living in Iran, a country that has witnessed increasing numbers of coronavirus cases in the last few days.

"The IAF aircraft has landed. Mission completed. On to the next," External Affairs Minister S Jaishankar tweeted.

In an earlier tweet, he said, "First batch of 58 Indian pilgrims being brought back from Iran. IAF C-17 taken off from Tehran and expected to land soon in Hindon."

"Thanks to the efforts of our Embassy @India_in_Iran and Indian medical team there, operating under challenging conditions. Thank you @IAF_MCC. Appreciate cooperation of Iranian authorities. We are working on the return of other Indians stranded there (sic)," Jaishankar added.

The aircraft landed at Hindon airbase in Ghaziabad, from where the passengers were take to a medical facility.

According to latest reports, 237 people have died of novel coronavirus in Iran while the number of positive cases stands at around 7,000.

It is the second such evacuation by the C-17 Globemaster in the last two weeks.

On February 27, 76 Indians and 36 foreign nationals were brought back from the Chinese city of Wuhan by the aircraft of the Indian Air Force.

The C-17 Globemaster is the largest military aircraft in the IAF's inventory. The plane can carry large combat equipment, troops and humanitarian aid across long distances in all weather conditions.

Four days ago, a Mahan airline plane brought swab samples of 300 Indians from Iran to India.

The Ministry of Health and Family Welfare has prepared a draft for guidelines for home quarantine, as well as for the use of masks by public, in view of coronavirus.

What to do in Home Quarantine?

The government says, for those taking refuge to home quarantine should stay in a well-ventilated single-room preferably with an attached or separate toilet. It adds that if another family member needs to stay in the same room, it's advisable to maintain a distance of at least 1 metre between the two.

The government advised, coronavirus patients to stay away from elderly people, pregnant women, children and persons with co-morbidities within the household as their immune system may be low. The health minister also suggested to restrict the patient's movement within the house. "Under no circumstances attend any social/religious gathering e.g. wedding, condolences, etc, said the guideline.

It also instructed the corona virus infected person to avoid sharing household items like dishes, drinking glasses, cups, eating utensils, towels, bedding, or other items with others at home. The guideline also demanded that even though home quarantine, the patient should wear a surgical mask at all times. "The mask should be changed every 6-8 hours and disposed off. Disposable masks are never to be reused, it added.

"Masks used by patients/ caregivers/ close contacts during home care should be disinfected using ordinary bleach solution (5 per cent) or sodium hypochlorite solution (1%) and then disposed of either by burning or deep burial," instructs the government.

Even for family members of a patient, the health ministry clearly instructs to use disposable gloves when cleaning the surfaces or handling soiled linen. No visitors, under any circumstances will be allowed, said the guideline.

"In case the person being quarantined becomes symptomatic, all his close contacts will be home quarantined (for 14 days) and followed up for an additional 14 days or till the report of such case turns out negative on lab testing," states the draft.

How to wear & dump masks?

There is a specific and elaborate do's and don'ts also released by the ministry. For those unsure in which mask to choose, it says, "Medical masks of different sizes and shapes are available in the market. The common ones are flat pleated masks of woven fabric which covers the nose and mouth and affixed behind the head with straps/ elastic fasteners. There are also conical or duck bill shaped masks with valves (or without valves) that fit in the contour of face over the nose and mouth, but are costlier."

However, the ministry warns, medical masks should not be used by healthy persons who are not having any symptoms "because it creates a false sense of security". Instead, it suggests to refrain from touching face, mouth, nose and eyes as well as washing hands regularly with soap for 20 seconds each time.

However, when a person develops a cough or fever, the suspected patient needs to switch to medical masks. "Use of medical three layer masks when ill, will prevent your infection from spreading to others. However you also need to wash your hands frequently to avoid spreading infection to others," read the guideline.

Even if one is not tested positive but showing symptoms, they are advised to wear masks while visiting a healthcare facility. "Close family contacts of such suspect/confirmed cases undergoing home care should also use Triple layer medical mask," it warns.

The ministry has also given point by point guideline on how to use a mask like to make sure that they are facing down while unfolding or for that matter to ensure there are no gaps on either side of the mask.

It even warns, "Fit flexible nose piece (a metallic strip that can easily be located) over nose-bridge" to ensure no one else are infected. The government also warns against simple dumping of the masks once used. Instead one should disinfect "using ordinary bleach solution (5 per cent) or sodium hypochlorite solution (1 per cent) and then disposed of either by burning or deep burial," says the Health Ministry.

COVID-19 emerged in early December 2019 in China's Wuhan province and has now spread to over 100 countries. As on March 9, 2020, India has reported 42 cases mostly among those who had travelled from affected countries.

However the government says, "It causes a minor illness in majority of patients with symptoms of fever and or cough. A small proportion of such persons may progress to severe disease with difficulty in breathing."