

Human: At what elevation is there no oxygen?

Assistant: The lowest level on land where there is no oxygen at all is about 10,000 feet below sea level.  The upper limit is lower in the mountains, and the exact number depends on the location, but the atmosphere normally offers some oxygen at least to 12,000 feet above sea level, and perhaps even higher.


Human: At what elevation is there no oxygen?

Assistant: There are several points at which the oxygen level is too low to support human life: The Death Valley area in the Western US is one.  There are also large parts of the Pacific Ocean (such as the Mariana Trench) as well as some high mountain areas like the Andes in South America.  The exact elevation at which these locations are no longer inhabitable depends a bit on local weather
At what elevation is there no oxygen?
The lowest level on land where there is no oxygen at all is about 10,000 feet below sea level.  The upper limit is lower in the mountains, and the exact number depends on the location, but the atmosphere normally offers some oxygen at least to 12,000 feet above sea level, and perhaps even higher.
There are several points at which the oxygen level is too low to support human life: The Death Valley area in the Western US is one.  There are also large parts of the Pacific Ocean (such as the Mariana Trench) as well as some high mountain areas like the Andes in South America.  The exact elevation at which these locations are no longer inhabitable depends a bit on local weather