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The coronavirus can stay aloft for hours in tiny droplets in stagnant air, infecting people as they inhale, mounting scientific evidence suggests.

This risk is highest in crowded indoor spaces with poor ventilation, and may help explain superspreading events reported in meatpacking plants, churches and restaurants.

It’s unclear how often the virus is spread via these tiny droplets, or aerosols, compared with larger droplets that are expelled when a sick person coughs or sneezes, or transmitted through contact with contaminated surfaces, said Linsey Marr, an aerosol expert at Virginia Tech.

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Aerosols are released even when a person without symptoms exhales, talks or sings, according to Marr and more than 200 other experts, who have outlined the evidence in an open letter to the World Health Organization.

What is clear, they said, is that people should consider minimizing time indoors with people outside their families. Schools, nursing homes and businesses should consider adding powerful new air filters and ultraviolet lights that can kill airborne viruses.

What does it mean for a virus to be airborne?

For a virus to be airborne means that it can be carried through the air in a viable form. For most pathogens, this is a yes-no scenario. HIV, too delicate to survive outside the body, is not airborne. Measles is airborne, and dangerously so: It can survive in the air for up to two hours.

For the coronavirus, the definition has been more complicated. Experts agree that the virus does not travel long distances or remain viable outdoors. But evidence suggests it can traverse the length of a room and, in one set of experimental conditions, remain viable for perhaps three hours.

How are aerosols different from droplets?

Aerosols are droplets, droplets are aerosols — they do not differ except in size. Scientists sometimes refer to droplets fewer than 5 microns in diameter as aerosols. (By comparison, a red blood cell is about 5 microns in diameter; a human hair is about 50 microns wide.)

From the start of the pandemic, the WHO and other public health organizations have focused on the virus’s ability to spread through large droplets that are expelled when a symptomatic person coughs or sneezes.

These droplets are heavy, relatively speaking, and fall quickly to the floor or onto a surface that others might touch. This is why public health agencies have recommended maintaining a distance of at least 6 feet from others, and frequent hand washing.

But some experts have said for months that infected people also are releasing aerosols when they cough and sneeze. More important, they expel aerosols even when they breathe, talk or sing, especially with some exertion.

Scientists know now that people can spread the virus even in the absence of symptoms — without coughing or sneezing — and aerosols might explain that phenomenon.

Because aerosols are smaller, they contain much less virus than droplets do. But because they are lighter, they can linger in the air for hours, especially in the absence of fresh air. In a crowded indoor space, a single infected person can release enough aerosolized virus over time to infect many people, perhaps seeding a superspreader event.

For droplets to be responsible for that kind of spread, a single person would have to be within a few feet of all the other people, or to have contaminated an object that everyone else touched. All that seems unlikely to many experts: “I have to do too many mental gymnastics to explain those other routes of transmission compared to aerosol transmission, which is much simpler,” Marr said.

Can I stop worrying about physical distancing and washing my hands?

Physical distancing is still very important. The closer you are to an infected person, the more aerosols and droplets you may be exposed to. Washing your hands often is still a good idea.

What’s new is that those two things may not be enough. “We should be placing as much emphasis on masks and ventilation as we do with hand washing,” Marr said. “As far as we can tell, this is equally important, if not more important.”

Should I begin wearing a hospital-grade mask indoors? And how long is too long to stay indoors?

Health care workers may all need to wear N95 masks, which filter out most aerosols. At the moment, they are advised to do so only when engaged in certain medical procedures that are thought to produce aerosols.

For the rest of us, cloth face masks will still greatly reduce risk, as long as most people wear them. At home, when you’re with your own family or with roommates you know to be careful, masks are still not necessary. But it is a good idea to wear them in other indoor spaces, experts said.

As for how long is safe, that is frustratingly tough to answer. A lot depends on whether the room is too crowded to allow for a safe distance from others and whether there is fresh air circulating through the room.

What does airborne transmission mean for reopening schools and colleges?

This is a matter of intense debate. Many schools are poorly ventilated and are too poorly funded to invest in new filtration systems. “There is a huge vulnerability to infection transmission via aerosols in schools,” said Don Milton, an aerosol expert at the University of Maryland.

Most children younger than 12 seem to have only mild symptoms, if any, so elementary schools may get by. “So far, we don’t have evidence that elementary schools will be a problem, but the upper grades, I think, would be more likely to be a problem,” Milton said.

College dorms and classrooms are also cause for concern.

Milton said the government should think of long-term solutions for these problems. Having public schools closed “clogs up the whole economy, and it’s a major vulnerability,” he said.

“Until we understand how this is part of our national defense, and fund it appropriately, we’re going to remain extremely vulnerable to these kinds of biological threats.”

What are some things I can do to minimize the risks?

Do as much as you can outdoors. Despite the many photos of people at beaches, even a somewhat crowded beach, especially on a breezy day, is likely to be safer than a pub or an indoor restaurant with recycled air.

But even outdoors, wear a mask if you are likely to be close to others for an extended period.

When indoors, one simple thing people can do is to “open their windows and doors whenever possible,” Marr said. You can also upgrade the filters in your home air-conditioning systems, or adjust the settings to use more outdoor air rather than recirculated air.

Public buildings and businesses may want to invest in air purifiers and ultraviolet lights that can kill the virus. Despite their reputation, elevators may not be a big risk, Milton said, compared with public bathrooms or offices with stagnant air where you may spend a long time.

If none of those things are possible, try to minimize the time you spend in an indoor space, especially without a mask. The longer you spend inside, the greater the dose of virus you might inhale.

New Delhi, Feb 26: Calling the recent violence in Delhi as 'planned conspiracy', Sonia Gandhi on Wednesday demanded Union Home Minister Amit Shah's resignation over the clashes that left 20 people dead in two days.

"CWC (Congress Working Committee) believes Home Minister and Centre is responsible. The Home Minister should tender his resignation with immediate effect," the Congress party's interim chief told reporters here.

Violent clashes erupted between pro and anti-CAA groups in parts of northeast Delhi on Monday, leading to widespread vandalism and arson for over two days.

While many blamed police for inaction to control the mobs, Union Home Minister Amit Shah met the top brass of Delhi Police, Chief Minister Arvind Kejriwal, LG Anil Baijal and directed the officials to control the situation.

Gandhi blamed both the Central and the Delhi governments, saying the administration did not take adequate steps on time to curb violence in the national capital.

"Chief Minister Arvind Kejriwal and Center is equally responsible for not activating the administration to reach out to the people to maintain peace and harmony," Sonia added.

The death toll in the violence rose to 20 on Wednesday, according to GTB hospital authorities.

Government sources told ANI that the National Security Advisor (NSA) Ajit Doval has been given the charge of bringing normalcy in the capital.

Sources also said that Doval will brief Prime Minister Narendra Modi and the Cabinet about the prevailing situation.

The NSA last night visited Jaffrabad, Seelampur and other parts of northeast Delhi where he held talks with leaders of different communities.

Without naming any leader, the Congress interim president also targeted the leaders of the Bharatiya Janata Party for making inflammatory statements saying that "there is a conspiracy behind the violence, country also saw this during Delhi elections. Many BJP leaders made inciting comments creating an atmosphere of fear and hatred."

New Delhi, Apr 21: The historic rout in oil markets that sent US crude prices plummeting to as much as minus USD 40 a barrel is unlikely to translate into any big reduction in petrol and diesel prices in India as domestic pricing is based on different benchmark, and refineries are already filled up to brim and cannot buy US crude just yet.

With storage capacity already overflowing amid coronavirus-induced demand collapse, traders rushed to to get rid of unwanted stocks triggering the collapse of US West Texas Intermediate (WTI) crude for May delivery.

Indian Oil Corp (IOC) Chairman Sanjiv Singh said the collapse was triggered by traders unable to take deliveries of crude they had previously booked because of a demand collapse. And so they paid the seller to keep oil in their storage.

"If you look at June futures, it is trading in positive territory... around USD 20 per barrel," he said.

Low oil prices may seem good in short-term but in the long run it will hurt the oil economy as producers will have no surplus to invest in exploration and production which will lead to a drop in production, he said.

He did not comment on retail fuel prices that have been static since March 16.

Oil companies have not changed rates despite a fall in international prices as they first adjusted them against the increase that was warranted from a Rs 3 per litre hike in excise duty and close to Re 1 per litre additional cost of switching over to cleaner BS-VI grade fuel from April 1.

Petrol in Delhi is priced at Rs 69.59 a litre and diesel comes for Rs 62.29 per litre.

"The negative price has no direct impact on India or Indian oil prices, as this has taken place due to crude oil produced and traded within the US. India's prices are driven partly by another benchmark, the Brent, which is still trading at USD 25/barrel. Therefore, the retail price of fuels in India are unlikely to fall," said Amit Bhandari, Fellow, Energy and Environment Studies, Gateway House.

Also, Indian refineries are already overflowing as fuel demand has evaporated due to the unprecedented nationwide lockdown imposed to curb spread of COVID-19. So, they can't rush to buy US crude.

The refineries have already cut operating rate to half because the fuel they produce has not been sold yet.

India imports 4 million barrels/day (1.4 billion barrels/year) of oil. The country has been benefitting from the falling prices of oil for the last five years, when oil dropped from a peak of USD 110/barrel to USD 50-60/barrel last year, enabling India to invest in public service programmes.

"However, the additional USD 30 fall of this week is good for India - but there is also a downside. If oil prices are too low, the economies of oil-rich gulf countries will be hurt, threatening the job prospects of the 8 million Indians working in the Gulf countries. India is the largest recipient of foreign remittances due to these workers – very low oil prices will hurt this cash stream," Bhandari said.

He said the negative price of oil shows how much oil oversupply exists in international markets today. "Global oil consumption has fallen due to the COVID-19 pandemic that traders are willing to pay customers to get rid of the barrels they can't store. The world does not have enough storage capacity, and dumping the oil is an environmental crime."

The first half of April saw Brent crude oil prices plummet 63.6 per cent to USD 26.9 per barrel. Prices of Western Texas Intermediate (WTI), the American oil, had also fallen similarly by 63.1 per cent.

But on April 20, WTI prices turned rapidly negative because traders on the Nymex exchange rushed to offload their May futures positions a day before expiry of contracts (on April 21).

Such WTI futures are traded on the Nymex exchange with contracts settled in physical crude oil. Problem is, those who had gone long are unable to find storage facilities for the oil and had to liquidate their contracts before expiry. This caused the plunge in WTI prices.

Contrast to this, June WTI Nymex futures prices is hovering around USD 21, while Brent for June delivery is at USD 25.

Miren Lodha, Director, CRISIL Research said the demand for crude oil was declining already because of economic slowdown when the COVID-19 pandemic-driven lockdowns crushed it further.

Consequently, oil demand is expected to contract by 8-10 million barrels per day (mbpd) in 2020 assuming demand recovery begins from the third quarter of the year, he said, adding if recovery doesn't happen by then, further demand destruction could occur.

On the supply side, producers reining in output following a strategic deal between OPEC members, Russia and the US.

Under this agreement, OPEC+ would reduce oil production by 9.7 mbpd for May and June, but gradually ease the curb to 7.7 mbpd between July and December 2020, and to 5.8 mbpd till April 2022 to stabilise prices.

"This is expected to reduce some surplus in the market by the end of 2020," Lodha said.

Crude oil demand is expected to decline by over 20 mbpd in April alone. Typically, monthly global demand is about 100 mbpd. Given this scenario, supply curbs would have limited influence.

Consequently, Brent oil prices is expected to be in the USD 25-30 range for the second quarter while increasing marginally in the last 2 quarters of 2020.

"The gigantic inventory build-ups and lack of storage facilities would also put pressure on prices," he said, adding overall Brent could average USD 30-35 in 2020, with a strong downward bias.