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Image zoom PM 2.5 Filters According Dr. Evelyn Darius, a physician with virtual health platform PlushCare, PM 2.5 filters are composed of nanofibers designed to filter particles down to 2.5 microns in size. Particulate matter, PM, refers to any substance floating in the air, from dust to pollen to viruses, she explains. Most viruses are 0.004 to 0.1 microns in size, which is about 100 times smaller than bacteria, so it is best to choose a filter with a PM 2.5 rating, which should filter out most viruses, including coronavirus. Shop Now: Cherislpy Polypropylene Disposable Face Mask Filter Image zoom Polypropylene Filters Since increased humidity can decrease the efficiency of a filter, Dr. Darius says adding a polypropylene layer to a mask can provide extra protection against airborne viruses. Polypropylene is a polymer that is characteristically non-absorbent and hydrophobic, she explains. The nature of

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