Why vacuum cleaner bags make the most effective face masks

You have probably become used to wearing a face mask in public. And you probably wear a fabric one, as we’ve been urged to save N95, FFP3, and other “clinical grade” masks for healthcare workers. This is despite science not knowing how well fabric masks work. To overcome this, a team that I am part of at the University of Cambridge decided to test various fabrics to see how well they would protect the wearer and the public when used in face masks. One element of fabric mask efficacy can be discovered by looking at how well various materials block…

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