1/ Gr8 that @cdc has discovered the dual (lower emissions & less inhalation dose) benefits of masks. A 5 min Sci Citation Index search leads to several past papers of relevance. Here is one by researchers @cdc's very own @NIOSH from 2010.
pubmed.ncbi.nlm.nih.gov/20584862/
pubmed.ncbi.nlm.nih.gov/20584862/
https://twitter.com/CorsIAQ/status/1320211048931078146
2/ This paper was cited in tweets by several researchers earlier in the pandemic & shows 40% to 60% removal efficiency (100% - penetration%) for 1 um particles at receptor end (& so even better for > 1 um) for some materials (much worse for others).
3/ More recent results reported by @linseymarr, @Smogdr, & their colleagues/teams significantly increase knowledge of different materials, layered materials, particle size effects, etc.
My previous tweet illustrating dual benefits. 40+40 = 64%, 50+40 = 70%, 60+60=84%, etc.
My previous tweet illustrating dual benefits. 40+40 = 64%, 50+40 = 70%, 60+60=84%, etc.
4/ If EVERYONE wears a mask in an indoor space, then any infectors are wearing a mask. In that case it is not difficult to achieve 60 to 80% reduction in inhaled deposited dose. Period. What an amazing FIRST step in layered dose (& therefore risk) reduction. #Masks. Just Do It!
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