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In 2267, the Galileo crash landed on Taurus II. Doctor Leonard McCoy considered the planet's atmosphere breathable, which was an and oxygen-nitrogen mixture, with acceptable quantities of neon, argon, and krypton. (TOS: "The Galileo Seven")
Later that year, the Galileo was forced to land on a Gamma Canaris N. The crew found the atmosphere to also be an oxygen-nitrogen compound very similar to that of Earth, again containing trace amounts of neon, argon, and krypton. (TOS: "Metamorphosis")