→ Physiological effects :
A high arterial partial pressure of carbon dioxide ( Pa CO2 ) causes changes in brain activity that adversely affect both fine muscular control and reasoning. EEG changes denoting minor narcotic effects can be detected for expired gas end tidal partial pressure of carbon dioxide (…) increase from ((53,000 PPM)) to approximately (…) (66,000 PPM = 0.066 atm). The diver does not necessarily notice these effects.
This is one I feel is getting largely overlooked.
Present day atmosphere is about 400 or 450 PPM compare this to :
CO2 poisoning (Hypercapnia) https://en.m.wikipedia.org/wiki/Hypercapnia
→ Physiological effects :
A high arterial partial pressure of carbon dioxide ( Pa CO2 ) causes changes in brain activity that adversely affect both fine muscular control and reasoning. EEG changes denoting minor narcotic effects can be detected for expired gas end tidal partial pressure of carbon dioxide (…) increase from ((53,000 PPM)) to approximately (…) (66,000 PPM = 0.066 atm). The diver does not necessarily notice these effects.