These are N95 masks, and they're worn by people who may be exposed to airborne viruses or bacteria, such as in an emergency room or during an outbreak of the flu. Free N95 masks milwaukee free N95 mask cNN Health states that if you are exposed for an extended period of time or repeatedly. Anti Virus N95 hantavirus with so many fragments flying around, it is simple to sustain an injury. The Centers for Disease Control and Prevention advise against using a N95 mask for longer than 8 hours in a day. But in order to reap the benefits of a reusable mask like an N95 mask. The CDC recommends that universal masks be worn indoors by all teachers.
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