Opinion: given the wide variety of face coverings that people are now wearing, how do we know which is most effective? By Simon Kolstoe, University of Portsmouth If a surgeon arrived at the operating theatre wearing a mask they had made that morning from a tea towel, they would probably be sacked.
This is because the equipment used for important tasks, such as surgery, must be tested and certified to ensure compliance with specific standards.
But anyone can design and make a face covering to meet new public health requirements for using public transport or going to the shops.
Indeed, arguments about the quality and standard of face coverings underlie recent controversies and explain why many people think they are not effective for
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