Mar 09, 2020 · PM 2.5 means the mask will prevent the entry of particulates that are 2.5 microns in diameter. Coronaviruses are usually 0.5 microns in diameter. That’s about 1
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For the readers not familiar with particles size, PM 10 refers to particles smaller than 10 micrometer, and for PM 2.5, it refers to smaller than 2.5 micrometers. So, filtering out all the particulates smaller than " 0.1 microns (same as 0.1 micrometers)",
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While discussing today about the faq entry on PM 10 versus PM 2.5 which I posted yesterday, my friend Klaus challenged on the usefulness of protection masks. He was actually wondering if the modern masks can nowadays really filter efficiently all the small harmful PM 2.5 particulate matter? Actually, this is a very good question!
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Mar 18, 2020 · While face masks can help reduce the spread of the flu and other respiratory viruses, they only do so if worn correctly and frequently. Here are some guidelines for proper mask-wearing:
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