3 ms·

As far as I know, this has been medical procedure for months now.

• mikeyouse 6y ago
  Many hospitals are wearing two masks but for slightly different reasons. N95s are almost certainly sufficient to protect you if they’re worn correctly. If you’re an employee at a hospital, they’ll do what’s called a fit-test to ensure you can get a full seal on your mask. It involves a strong-smelling substance outside the mask and if you can smell it, your mask hasn’t sealed properly. The second (often cheap surgical) mask is merely to protect the more expensive N95 since they’re in relatively short supply still. Surgical masks have plenty of supply and are cheap so they can be tossed out in between patients to limit the risk of cross infection. Outside of healthcare settings, N95s are rare and often worn incorrectly so a second mask over the first is actually providing moderately more filtration and protection.
  • mrfusion 6y ago
    N95s are good but you also have to wear them correctly (and be clean shaven?) and frequently change them.