N-95 masks were originally given to us at the hospital years ago, intended for TB patients. Each Nurse had to be fitted specifically so as not to allow any air (germs) to get underneath it. Homemade masks should not be used in a clinical setting. Filtration material is between the inside layers and they must be approved by the CDC. Probably for liability reasons. Around the house or neighborhood, perhaps. They can also give the wearer a false sense of security, thinking they are safe.
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Nassim Abu Roumayssa Douzi In an ordinary life situation your risk of catching covid is low. So a cloth mask is okay although social distancing without a mask would be okay. In the hospital you have a high risk of coming into contact with Coronavirus. So having proper N95 masks saves lives. A lot of the doctors and nurses who died were not wearing proper PPE. The public hoarding this keeps it out of the people who need its hands.