44 Has anyone ever used this to fight mask mandates at work? “In the preamble to the final Respiratory Protection Standard, OSHA discussed extensively its rationale for requiring that employees breathe air consisting of at least 19.5 percent oxygen.” (www.osha.gov) posted 3 years ago by cody17 3 years ago by cody17 +44 / -0 5 comments share 5 comments share save hide report block hide replies
I think you mean "they" being mask wearers "are breathing IS at MOST 19.5% oxygen".
Otherwise, its simply not true and can easily be verified.