I am been making an alien planet for my xenobiology project, this planet would have an atmospheric pressure of 1.5 atm and it would be composed of the following gases:
Nitrogen: 83.7%
Oxygen: 10.4%
Methane: 3.1%
Argon: 1.2%
Water vapor: 1.1%
Carbon Dioxide: 0.4%
along with some traces gases which include:
Helium: 0.001%
Ammonia: 0.005%
Neon: 0.002%
Hydrogen Sulfide: 0.002%
Nitrogen Dioxide: 0.000001%
Ozone: 0.00005%
Sulfur Dioxide: 0.00001%
Krypton: 0.0002%
Xenon: 0.00001%
would this atmosphere be breathable? And what effects might the gases have on the planet?
edit: after some consideration, I decided to increase the oxygen level to make the atmosphere more breathable, this is what the chemical composition looks like now:
Nitrogen: 78.1%
Oxygen: 16%
Methane: 3.1%
Argon: 1.4%
Water vapor: 1.1%
Carbon Dioxide: 0.15%
I also included trace gases:
Helium: 0.001%
Ammonia: 0.005%
Neon: 0.002%
Hydrogen Sulfide: 0.002%
Nitrogen Dioxide: 0.000001%
Ozone: 0.00005%
Sulfur Dioxide: 0.00001%
Krypton: 0.0002%
Xenon: 0.00001%
I also increased the atmospheric pressure from 1.5 atm to 1.6 atm
edit 2: I also decreased the amount of carbon dioxide in the atmosphere composition above