Would the atmosphere of an alien planet with the following mixture of gases be breathable to humans?

On an exoplanet with a mass of 0.284 Earths and a surface gravity of .66 gs (6.44 m/s^2), would this atmosphere be breathable to humans? If so, would there be any long term effects compared to our atmosphere here on Earth? I've heard argon is narcotic, but I'm not sure at what concentration it becomes a noticeable hindrance to human activity.

As an additional question, what color would the sky be on this planet assuming it orbits a star like ours? :)

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Would the atmosphere of an alien planet with the following mixture of gases be breathable to humans?

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