Would increasing pressure help compensate for dropping oxygen ?

[Geer1]

Exactly why I didn't state a specific value. If you own an oximeter and are keeping an eye on oxygen levels I assume you know what your normal range is and that you are capable of determining when they are abnormal at which point you should reach out to medical care (call 911 etc). Most likely you will also feel like you are having trouble breathing etc although there are reports of "silent hypoxia".