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CO2 is toxic. On Earth we have 0.03% to 0.04% CO2, but short term exposure to anything below 2% is not harmful. All this is at 1 atmosphere pressure. Concentrations above 3.3% cause increasingly severe symptoms
Recheck those numbers you are off by x100 earths atmosphere is .03 to .04 or 3-4 percent co2
CO2 may be toxic in high enough concentrations but i seem to remember it is also essential to human life and is used througout the body as well as produced in surplus and excreted by breathing. it is essential to plant life as well.
The CO2 is still too high at 2.8%.
an atmosphere of 2.8 percent should be perfectly breathable but may me just a little on the weak side for plants since they prefer as low as 3% or as high as around 8%. One of the mysteries of science is why do plants like up to 3x current co2 levels? One theory is at one time earth may have had as much as 3x current levels. some cities get as much as 4-5% so i doubt people will suffer much from a little higher than normal levals but i am sure research does exist.
I believe argon is used by deep sea divers to compensate for high pressures as a signifigant portion of the mix. Researching deep sea scuba equipment schemes should shed additional light on exactly what atmospheres and co2 levels are usable to humans although it may not give info on corosiveness or explosiveness of said atmospheres. Also any longer term colonization efforts will likely require some sybiotic life forms such as plants to recyle air as well as provide sustenance Actually suficient plant life could concievably reform the co2 to oxygen provided controlled amounts were applied.
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