As for the breathability of the atmosphere. I encountered this list in a video by worldbuilding YouTuber Artifexian and have added to it since. I did check several values and found them to be correct. Going down the list it became increasingly difficult to verify the values, so take everything without a link with a grain of salt.
1.25 atm, o.k
0.00045 atm, o.k
0.000165 atm, exceeded by 3 orders of magnitude
0.1725 atm, low but o.k
0.00006 atm, o.k but very low, see below
0.00135 atm, o.k I would be surprised if anyone would even notice, nevermind get knocked out.
There is surprising little Argon in the atmosphere.
Nearly all of the argon in the Earth's atmosphere is radiogenic argon-40, derived from the decay of potassium-40 in the Earth's crust. In the universe, argon-36 is by far the most common argon isotope, as it is the most easily produced by stellar nucleosynthesis in supernovas. - Wikipedia
Argon isn't in the atmosphere by chance but as a result of the alpha decay of potassium-40. This means that the planet is either very young (not older than maybe 0.5 byr at most), in a low metallicity system (meaning it would most likely be a planet dominated by water), lost its original atmosphere in a geographically speaking recent event, is an artificial world around a gas giant or black hole or is so small (moon-sized) that it had little radioactive material, to begin with. If none of these assumptions are correct, I suggest adding argon.
And you are going to have one hell of a greenhouse effect CO2(factor of 4.5), H2O (factor of 24), CH4 (factor of 3), NO3 (factor of 4.5), O3 (factor of 41.25) and H2 (no direct effect, yet it increases the lifetime of other gases) are relevant for the greenhouse effect. Ignoring anything but H2O and CO2, which are responsible for most of Earths greenhouse effect (this is not really a clean approach as you added even more of the minor and stronger greenhouses gases) we see that you increased those by a combined factor of 66. Now calculating greenhouse effects is really hard and requires simulation programs, but it is save to say that it will be way higher than Earths 33 K. Maybe 150 K? Now you are either dealing with a planet with a runaway greenhouse effect, which is on the way to become an exo-Venus or one still habitable but near the outer edge of the habitable zone. In Solar system terms, this means out beyond Mars or even in the asteroid belt.
Where does this leave us? Ozone is way too common but it might still be fine because ozone is usually found in the ozone layer and not in the troposphere. The greenhouse effect might turn the planet into a cooking-pot. Then the air won't be breathable because it will boil you alive. Avoid getting the planet hotter than 47 °C to avoid the greenhouse effect. So apart from this, the fact that there is an odd lack of argon and that your greenhouse effect will be enormous compared to Earth the atmosphere is breathable.