Those who break the rule risk a fine of £ 100, the government has announced.
Health Secretary Matt Hancock said traders “can deny entry” to those not wearing liners and that police enforcement would be the “last resort”.
According to the World Health Organization (WHO), wearing a three layer when traveling is preferable – the outer layer must be water resistant, the inside must be water absorbent and the middle layer acts as a filter, reports Coventry Live.
WHO says that wearing a face mask alone will not protect people from coronavirus, and that wearing a face covering should be done in conjunction with regular hand washing and social distancing.
Face covers can be made from scarves, bandanas or other fabric items, as long as they cover the mouth and nose, the government said.
However, scientists at the Leverhulme Center in London have studied different types of face covers used by people in the general public and have stated that some coatings are not as effective as others – with loosely woven fabrics, such as scarves , which have been shown to be the least effective. .
What masks do not work?
Professor Melinda Mills, director of the Leverhulme Center, said: “You also have to be careful about how it fits on your face; it should loop around the ears or around the nape of the neck for better coverage. ”
She added: “We find that masks made from high quality materials such as high quality cotton, multi-layers and particularly hybrid constructions are effective.
“For example, the combination of cotton and silk or flannel ensures filtration at more than 95%, so wearing a mask can protect others. “
So the rest works?
A report recently released by the Royal Society suggests that even basic homemade masks can reduce transmission if enough people wear them in public.
The study, based on mathematical modeling, showed that if an entire population wore only 75% effective face coatings, this would bring the R value, which is the number of people an infected person transmits the virus, from 4 , 0 to minus 1.0, no need for locking.
Meanwhile, another study that looked at deaths from coronaviruses in 198 countries found that countries with policies promoting the use of masks had lower death rates.
In another scientific research article, published in the journal Proceedings of the National Academy of Sciences last month, scientists calculated that wearing face covers prevented more than 78,000 infections in Italy between April 6 and 9 May, and more than 66,000 infections in New York. between April 17 and May 9.
Dr. Julian Tang, associate professor of respiratory science at the University of Leicester, said wearing face covers in public places could keep the R value below 1 by creating “artificial herd immunity”.
He said: “If you look at other countries outside the UK – like Japan or Hong Kong – they have much higher masking percentages and are well below the epidemic curves of the West. “
But Dr. Simon Clarke, associate professor of cell microbiology at the University of Reading, said that although facial covers can reduce the spread of droplets from coughing, solid epidemiological evidence on their benefits is still lacking.
He told the Palestinian Authority news agency, “You can see that they (the face covers) are mechanically obvious, but that is not confirmed by what is really going on.
“What is really important is that you have the right mask, well adjusted and changed regularly. “
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Are there any advantages to wearing them?
Experts say the risk of coronavirus transmission appears to be higher in poorly ventilated indoor spaces, and that wearing face covers in small stores or closed malls may help reduce the spread.
Keith Neal, Emeritus Professor of Epidemiology of Infectious Diseases at the University of Nottingham, said: “The lack of solid evidence of their effectiveness should not be considered a problem, but the evidence is mounting that they have a role to play in reducing transmission and also in protecting the wearer. ”
In addition, there is also increased evidence to suggest that many people with the virus who do not have symptoms may still be contagious.
Professor Neal told PA that although the evidence for the benefits of wearing face covers is “favorable rather than definitive”, he adds that “it is asymptomatic or presymptomatic people where the mask has the most benefits in terms of public health ”.
Meanwhile, a report released last month by the University of Oxford’s Leverhulme Center for Demographic Science noted: “In addition to hand washing and social distancing, masks and blankets are one of the non-pharmaceutical interventions most widely adopted to reduce transmission of the respiratory tract. infections. ”