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A True HEPA filter traps 99.97% of particles as small as 0.3 microns

[DOI] [PMC free article] [PubMed] [Google Scholar] Capps B (2016)

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Each person set a quit day of two weeks after they entered the study, and saw a research nurse once a week until then

A handful of top picks are kept around for longer-term testing, evaluation against new picks, and for use in testing auxiliary products like food dehydrators and the Plantaform indoor smart garden, but all others are donated locally, including to organizations like NYC public schools

A meta-analysis like this allows all studies to be assessed together, and gives a clearer picture of the research landscape
