unless you get the air that is left in the tank tested, you will never know
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I'd save the tank until my Analox CO analyzer came in, but I know that most wouldn't.unless you get the air that is left in the tank tested, you will never know
I agree with the CO2 theory. And the fact that you were breathing Nitrox not only doesn't alleviate the CO2, but may aggravate it. There is some evidence that breathing elevated ppO2s allows some people to tolerate higher pCO2s without air hunger.