Salute!
Thanks, Megan.
Very hard for me to find the FAA recommended oxy saturation numbers, but I recall 92%....regardless of altitude.Below 92% , FAA claims that cognitive ability and physical reaction times are impaired.
The altitude rules are averages of folks' physiology and averages of atmosphere pressures and such we might encounter. I would prefer actual oxygen saturation as I see when monitoring, and ditto for cabin contamination versus a simple altitude measurement.
Gums sends...