Researchers have devised a test for face masks to show which are the best at blocking droplets of fluid – and rated several current options.
In a proof-of-concept study, scientists at Duke University in Durham, North Carolina, devised a low-cost laser sensor that could spot the masks that were best at stopping droplets spreading.
The team led by Eric Westman found that medical-grade ‘N95’ masks and surgical masks performed extremely well.
Handmade cotton masks also performed well, eliminating a substantial amount of the spray from normal speech.
But improvised face coverings such as bandanas and balaclava-style face coverings were less effective, the researchers found.
Duke researchers created an ine...
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