Some masks offer more protection than others.
For the best protection, choose a high-quality mask like a KN95 or N95 mask. Make sure the mask fits snugly around your face while still being able to breathe easily. Pick a mask with layers to keep your respiratory droplets in and other's out.
Think of masks as something you layer on and layer off. If you are in an activity with a high risk of COVID-19 (i.e. large indoor gathering), then wear a well-fitting mask. If you are in an activity with a low risk of COVID-19 (i.e. outdoor hiking), then you don’t need to wear a mask. Take into account your risk and the risk of others to make a decision about wearing a mask.
Los Alamos National Laboratory
New Mexico Department of Health
Original source found here.
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