I am a medical expert. I’m not trying to be overly pedantic but my point was that regular sea level air is around 21% oxygen so you were making it sound like the air at high elevations is higher than it is at sea level.
It’s not a wording issue. The link you posted has a table that says 100% O2 at sea level. Literally every single figure in the chart on that page is wrong because they list it as “%O2” instead of saying percent of baseline, which would be out of 21%. So at sea level you’re getting 100% of the normal oxygen in the air, which is 21%, and that declines, but the table is written incorrectly. It says that 8848 meters above sea level the content of air would be 33% oxygen. The table under that is more accurate.
It’s just a bad table and bad writing. Idk if I’m explaining any of this properly.







Usually if I search anything seriously, like for work, I use journals that require a subscription that I access through my institution. If I’m trying to find a funny meme, that’s different. Google is fine for the casual stuff, but since I just don’t like them DuckDuckGo seems like an acceptable alternative even though I’ve found it slightly less effective.