Sci Show: How Masks Affect Airflow, Protection Effectiveness. The filtration efficiency of the three-layer surgical mask can vary from 65%, if new, to 25%, when used, so wearing a 65% mask properly will provide good protection, but wearing a 25% filtration mask can be worse than not wearing one at all.

Sunday, December 20, 2020

How Masks Affect Airflow, Protection Effectiveness. The filtration efficiency of the three-layer surgical mask can vary from 65%, if new, to 25%, when used, so wearing a 65% mask properly will provide good protection, but wearing a 25% filtration mask can be worse than not wearing one at all.

https://ift.tt/34ucIze via /r/science https://ift.tt/34uiNvj

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