Why is a swine flu mask called N95?

Why is a swine flu mask called N95?Respirators or N95 masks can block 95% small particles that contain the H1N1 virus, which causes swine flu. These are expensive and can be used only for a single day. These masks are made of three layers of electrostaticallycharged microfibres, that block 95% particles, thus the name N95.

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