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New Delhi, Apr 16: South Delhi District Magistrate Brij Mohan Mishra on Thursday said that the administration is investigating how the pizza delivery boy contracted the coronavirus.

"In the last 15 days, we discovered houses he had delivered food. We contacted people living in 72 houses and they have been asked to stay in-home quarantine. No symptoms have been seen in people related to him. 

Testing of his roommate has been done and his reports are awaited. The rest of the people don't have any symptoms, they have been placed under institutional quarantine. Those in-home quarantines are also asymptomatic," Mishra said.

"Unless a positive case comes, we feel that transmission has not taken place. The boy told us that he was continuously wearing a mask while delivering the food. We are also finding out how he got infected. We are getting the information about the places he visited for delivery. He was tested on the basis of the doctor's advice. Later, he tested positive," he said.

72 families have to stay in home quarantine in the Malviya Nagar area after the delivery boy tested positive for COVID-19 on Wednesday.
Delhi Health Minister Satyendra Jain said that 17 other delivery boys linked with the infected person have also been placed under institutional quarantine.

"A pizza delivery boy has been detected with COVID-19 here. 17 other delivery boys linked with him have been placed under institutional quarantine and 72 people have been placed under home quarantine," Jain said.

Food delivery app Zomato said that the staff of the infected person's restaurant has delivered some orders which were placed on its platform.

"We've been made aware today that a restaurant's employee, who has been recently tested positive for COVID-19, had delivered food in the past to a few customers in the Malviya Nagar area in Delhi. All these customers have already been contacted by the govt authorities... We are not sure whether the rider was infected at the time of delivery," the company said in a statement.

Zomato also claimed that colleagues of the delivery boy have tested negative for COVID-19.
"This restaurant had instructed their riders to wear masks and follow strict hygiene to keep customers safe from any unintended mishap.

All co-workers of the said rider have been tested negative. And as a precaution, the restaurant where this rider worked has suspended operations," read the statement.

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.

Jun 3: Emphasising that airlines are clearly the safest mode of transportation, IndiGo CEO Ronojoy Dutta on Tuesday said there is no evidence yet of coronavirus infection getting transmitted among passengers onboard an aeroplane.

His comments against the backdrop of instances of some passengers, who had taken flights after resumption of domestic air services on May 25, testing positive for coronavirus.

"Those people had the virus before they got on to the aeroplane. What is noteworthy is that they have done the tracing after that. There is no evidence of transmission onboard there... that is a very encouraging sign on the safety of airline travel," he said during an earnings call.

According to him, airlines are clearly the safest mode of transportation and there is no evidence yet of contamination on an aircraft.

"You can come in contaminated but so far there is no evidence of passing it on to a fellow passenger," he noted.

Amid concerns over the coronavirus pandemic, aviation regulator DGCA has asked airlines to ensure that to the extent possible, middle seat in flights should be kept empty.

In this regard, Dutta said the airline would keep the middle seat empty wherever it can and "where we have to fill the middle seat, we will have the extra protective gown".

To a query about possible hedging of fuel prices, he said it would be a dumb idea and that airlines adjust to ups and downs in fuel prices.

"I can't overemphasise what a dumb idea it will be for an airline to hedge fuel prices. I looked at it from different angles and it is not a good idea... we looked at hedging and we talked about it at the board level and we said no," he noted.