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Actually, I believe part of the reason divers doing deco take air breaks while on O2 is to reduce pulmonary toxicity.
When I took a 4 1/2 hour chamber ride at 60 feet, I had to take air breaks every 15 minutes. By the 4th hour I was coughing and felt like I was getting a cold. I had definite pulmonary toxicity signs. Not that the average recreational diver will ever do anything comparable, unless they take a chamber ride.
Oxygen is quite toxic to lungs and mucous membranes, worse at increased partial pressures than at 1 ATM.
When I took a 4 1/2 hour chamber ride at 60 feet, I had to take air breaks every 15 minutes. By the 4th hour I was coughing and felt like I was getting a cold. I had definite pulmonary toxicity signs. Not that the average recreational diver will ever do anything comparable, unless they take a chamber ride.
Oxygen is quite toxic to lungs and mucous membranes, worse at increased partial pressures than at 1 ATM.