When the Centers for Disease Control and Prevention first recommended that everyone wear a cloth mask in public in April 2020, there weren’t enough highly protective N95 respirators to go around. For ...

According to a recent CDC study, doubling up a disposable medical procedure mask with a cloth one can lower exposure to particles sized 0.1–7 μm (the typical range of SARS-CoV-2 particles) by about 83 ...