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"Stay protected while breathing freely with the O2 Nano Mask Reusable Nanofiltration Mask. Effectively blocking 99% of PM2.5 particles, this protective face mask features innovative nanotechnology. Tucked inside the two-layer mask skin is a three-layer nanofiltration membrane. Each membrane serves its own purpose to stop everything from smoke to bacteria to some viruses. Even with..."
<https://thegadgetflow.com/blog/nanofiltration-mask/>