Why simple cloth masks without valves are better at stopping the spread of COVID-19 – SF Gate

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Why simple cloth masks without valves are better at stopping the spread of COVID-19 – SF Gate

Those face masks you see with coin-sized valves on the front may look intriguing but they are not as good at preventing the spread of the novel coronavirus as the seemingly lower-tech, non-valved masks.
Some masks designed for hot, dusty construction work -…
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