the atmosphere consists of 20.942% O2 per volume and 23.135% per mass.
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Pluto does not have a significant amount of oxygen in its atmosphere or composition. The atmosphere of Pluto is primarily composed of nitrogen, with traces of methane and carbon monoxide. Oxygen is not a major component of the dwarf planet.
Oxygen is an element found in the air. It makes up about 21% of Earth's atmosphere.
The major component of Venus' atmosphere is carbon dioxide.
Io has a very thin atmosphere composed mostly of sulfur dioxide and traces of other gases like sulfur and potassium. Oxygen is not a significant component of Io's atmosphere.
Oxygen levels in the atmosphere are steady at around 20%. The other main component of the air is nitrogen, with a small amount of other gases, including carbon dioxide (CO2).