How many times can I reuse my N95 mask? It depends, but you should be able to use N95s and KN95s a few times. The U.S. Centers for Disease Control and Prevention says health care workers can wear an N95 mask up to five times. But experts say how often the average person can safely wear one will vary depending on how it’s used.
Using the same mask to run to the grocery store, for example, is very different than wearing it all day at work.
The amount of time a mask is worn is more important than how frequently it’s worn, says Richard Flagan, who studies masks and aerosols at the California Institute of Technology.
In general, he recommends limiting the use of an N95 mask to about two or three days.
With every breath you take in an N95, particles accumulate on the mask, Flagan says. That could make it more difficult to breathe if the mask has trapped a lot of particles. They are degrading the performance of the mask, Flagan says.
The elastic band on the mask could also get worn out and not fit around your face as snugly. It might also get dirty or wet, especially if you’re using it while exercising.
If you notice any of these changes to your mask, it’s time to stop using it even if you’ve only used it for a few hours. And since N95 masks can’t be washed, they should be thrown away once you can no longer use them.
Observations made by experts and scientists state that at this time, N95 masks offer the maximum protection against the spread of Covid-19. As per Centres for Disease Control and Prevention (CDC), an infected person without a mask can infect others in just 15 minutes if they are within 6 feet of each other.
If you both are wearing cloth masks, the time increases to 27 minutes; it reduces to 20 minutes if the uninfected person is wearing a cloth mask whereas the infected is wearing no mask.
Similarly, if the infected person is without a mask and the second person is wearing a surgical mask, the infection can transmit in 30 minutes. However, if the infected and uninfected individuals are wearing N95 masks, the virus will take 25 hours to transmit.
