This is the first question in a series on the physical limits of the human body.
The intent of this series is to, illustrate the upper and lower limits of human biology for the purpose of building worlds on which they can (or cannot) survive.
Other Questions: (obviously this will get updated as other questions are asked in the series.)
What are the maximum possible and minimum required for the human body to function properly, in percentage of the atmosphere near the sea level.
Future Questions will cover:
- Humans must be able to function at least efficiently enough to provide food, water, and shelter for themselves without the aid of hydrocarbon fuels (basically pre-industrial, pre-gunpowder technology).
This can be in the form of farming or hunting. Humans still need to be able to exert themselves physically without the atmosphere causing undue limitation on their ability to do so.