The face mask test: which are the best at limiting the spread of Covid?
by Linda Geddes from Science | The Guardian on (#59QT9)
Reusable masks vary hugely in ability to filter particles, say Which? researchers
Some fabric face coverings on sale in supermarkets and high-street pharmacies could be giving people a false sense of security by letting the vast majority of large particles pass through them, an investigation by the consumer magazine Which? has revealed.
Three of the masks the magazine's researchers tested failed to capture 93% of bacterial particles, meaning that these particles could be inhaled or exhaled by the mask wearer.
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