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Message: [QUOTE="CL82, post: 3528088, member: 44"] That was an interesting read. To summarize there are two factors in determining the effectiveness of a mask namely the amount of particulate screening and the fit to prevent leakage. The better the screening, the more likely the user is to force air through gaps creating leakage. Anecdotally, most people seem to have inadequate or poorly fitting masks. The one thing that they would seem to do effectively is keeping people touching their nose or mouth, although I have seen people take their mask down, wipe their nose with their hand and then put the mask back on. [/QUOTE]