What sorts of 02 and CO2 levels can humans tolerate?
I've tried to google it but i get swamped with global warming articles.
This is just for my own information.
Oxygen does have an effect on humans; high concentrations cause respiratory (i want to know HOW high).
thank you for the rough estimates of 5 and 7%
BTW, Why do you call CO2 a 'crazy gas'? Do you realize no life could exist without it? Do you realize that it is a relatively stable gas and oxygen (comparatively) is a noxious, corrosive, toxic substance that did not occur in large proportions on earth for much of its history?
Read some REAL science