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How does an N95 mask protect against pathogens?

The mask is composed of 4 layers, the bottom being the layer most exposed to external environments. They are bonded together on the exterior. Inner layers are often treated with metal ions which interact with viral particles to trap them inside. These masks are rated to trap most particles (95%) that are larger than 300µm. This is why they are most needed by healthcare workers in pathogen filled environments.

https://i2.wp.com/microcosmos.foldscope.com/wp-content/uploads/2020/03/IMG_4258.jpg?fit=1000%2C750&ssl=1

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nyaroon
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