It is possible to get too much 02, sometimes referred to as 02 poisoning. It's generally not possible to achieve 02 poisoning with home 02 equipment. It requires high volumes of 02 delivered under high pressure, something home 02 supplementary equipment isn't capable of.

Alice rose its when your 02 is higher than required can make you abit drunk like and bad headache

@A MyCOPDTeam Member.
In a round about way, you have explained how oxygen concentrators (portable or stationary) have pre-set limits. But you still leave the poster confused about HYPERoxemia.

The body can only hold so much Oxygen and never more than 100%. That's what we use the "finger-thingy" to measure for. As more oxygen is introduced (under any delivery pressure), the alveoli start to collapse and fail to perform the Oxygen/CO2 exchange process.

The true rate of exchange is determined by many things and can (only) be accurately measured with a partial oxygen test from the blood. A baby or young child will have a different supplemental O2 need than a mature, indolent or corpulent adult. Anything above those needs is still in excess and toxic. But you already know that.

The point is most home equipment produces concentrated oxygen in a 3 -5 liter flow range. This increases the purity of Oxygen to about 35-40% max. But unlike diving and mountain climbing activity where a close to 100% blended mix is used, Hyperoxemia can begin to occur for using anything above 50% AT Sea Level elevations and pressure. That would include folks using 10L flow equipment in their homes. Hang in there, were almost done.

We all know that temperature and pressure affect the volume (amount) is gasses available. Chemistry 101 anyone? Now increases in these variables mostly reduce how much O2 is hanging around to breathe in. But that's why we get prescribed supplemental O2 in the first place. Clear as mud?

Not quite sure where you resource materials from or if you just go off of retained knowledge. But, these warnings are not mentioned just to scare people or give something to chat about in a Forum. Now you know.

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A MyCOPDT...

@A MyCOPDTeam Member, I don’t use oxygen but I listened to the video since I do have sleep apnea and have a CPAP .

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A MyCOPDT...

Thanks @A MyCOPDTeam Member for pointing out the qualifier - "Under ordinary circumstances". My intent was to identify the possibility of Alice's question being a real concern ( under ANY circumstances) that the new COPD patient may be totally unaware of. IMHO, the problem with OUR respiratory condition is that "Ordinary" seems not to last very long. IT pays to VERIFY more than (we are able) to Trust. Too many dis-informed beliefs are floating around as Facts.
Touche'! My fault was not including the source of my research about Oxygen Poisoning:
https://en.wikipedia.org/wiki/Oxygen_toxicity. The reference to partial pressure I mentioned is the internal measure in the lungs and blood, not any measure from the oxygen producing source. That is always at room pressure. But you already know that.

With this information, Alice can form her own position about what to know (and what to Trust) about her oxygen use. To that end, I retire to my position where I am always looking for the current and informed data on diagnosis, treatment and life management with our condition.

Humor me at your next convenience. How about your thoughts on this historic phrase - Dum Spiro Spero?

Please pardon any offence unintended. This Forum needs more lively debate and interaction just the same. BE well.

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A MyCOPDT...