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Earth, and later on, the terraformed Mars' atmosphere, was 80% nitrogen and 20% oxygen. (AUDIO: The Resurrection of Mars) New Earth had the same atmosphere as Earth, which was why humans made it their new home after Earth was destroyed. (TV: New Earth)
During the Year That Never Was, Earth's atmosphere was temporarily opened to unleash an army of Toclafane. (TV: The Sound of Drums) The year after that, the Tenth Sontaran Battle Fleet made Luke Rattigan develop the ATMOS in cars across the entire planet Earth. This was part of their plan to poison Earth's atmosphere with clone feed, so Earth could become the new clone world for the Sontaran species. The Tenth Doctor later cleared the atmosphere, saving the planet. (TV: The Poison Sky)