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Altitude reduced the density of air as whole. The graphic is about changes in composition while density should remain similar, meaning if oxygen is low, something else (e.g. carbon mono-/dioxide) is high. So I wonder how this compares.
Partial pressure of the gases you breathe is what matters though, that's why astronauts could breathe pure oxygen for days during the Mercury/Gemini/Apollo missions and be fine (as long as there's no fire :/ ).
Just to clarify, the partial pressure of oxygen in the atmosphere is about 3 PSI. The partial pressure of Nitrogen in the atmosphere is about 10 PSI.
Fire risk is also related to the partial pressure of the gas. 100% oxygen is not actually a problem, so long as the partial pressure of that oxygen is low. The partial pressure of oxygen in the Apollo 1 capsule was about 16.7 PSI.
Astronauts still use 100% oxygen in space suits pressurized to about 5PSI.
I had always assumed they just compensated with oxygen pressure to match atmospheric partial oxygen pressure, but I checked and indeed you're right, but it was only that high an oxgen pressure for testing purposes on the ground. Once in flight, they would have dropped it to 5 PSI. It also makes sense as to why that Apollo 1 fire was so violent. Thanks for that learning opportunity ! :)
I was actually more referring to the chart implying that low oxygen means higher concentration of toxic gases