> This is well within OSHA limits and is very unlikely to be noticeable. Why does the study state, "The FFR dead-space oxygen and carbon dioxide levels did not

> This is well within OSHA limits and is very unlikely to be noticeable. Why does the study state, "The FFR dead-space oxygen and carbon dioxide levels did not meet the Occupational Safety and Health Administration’s ambient workplace standards." Do you have a source that counters this study, or are you just throwing some armchair mathematics out there?