How Many Times Can an N95 Mask Be Used Before It Becomes Ineffective Against COVID-19?

There are two parts of the question:

1.How long does an N95 mask lasts?

N95 masks remain effective far longer than a single day. This data suggests masks can retain fit effectiveness up to the point masks become so gross and hard to breathe in that most people would want to throw them out anyway. Or usually the strap of the mask would break so you have to get rid of it.

2. How to disinfect the mask after per use?

The simplest method of all is to channel your inner zen and do nothing! If you have a few masks, then simply leaving masks to dry should cause viruses to lose infectivity in 48 hours (72 hours would be even more conservative:  1,  2).

For more details and references, see here:

Get Your Free Guide to Breathing Safe

Join the thousand keeping up on the latest research & knowledge on how to breathe safe. Sign up now and receive a free guide to breathing safe!

Was this article useful?31

Leave a Comment

Smart Air is a social enterprise that creates simple, no-nonsense air purifier and provides free education to protect people’s health from the effects of air pollution. We are proud to be the only certified B-Corp dedicated to fighting air pollution.