An article in PLOS ONE provides a useful masking hierarchy:
All types of masks reduced aerosol exposure, relatively stable over time, unaffected by duration of wear or type of activity, but with a high degree of individual variation. Personal respirators were more efficient than surgical masks, which were more efficient than home-made masks. Regardless of mask type, children were less well protected. Outward protection (mask wearing by a mechanical head) was less effective than inward protection (mask wearing by healthy volunteers).
Conclusion. Always be a healthy volunteer.
Tags: masks · plosone · public health · ScienceNo Comments
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