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CDC says masks must fit tightly – and two are better than one

  • Written by Scott N. Schiffres, Assistant Professor of Mechanical Engineering, Binghamton University, State University of New York
CDC says masks must fit tightly – and two are better than oneMasks work only if they fit well, and wearing two can ensure a tight fit. Eduardo Maquilón/Getty Images/Stringer via Getty Images News

On Feb. 10, the Centers for Disease Control and Prevention released new mask guidelines based on a study of how mask fit affects the wearer’s exposure to airborne particles. With more transmissible...

Read more: CDC says masks must fit tightly – and two are better than one

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