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

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