the atmosphere is 78% Nitrogen and 21% Oxygen; the remaining 1% is composed of trace gases which are mostly unreactive Noble Gases, such as Argon, Helium, Neon and Xenon.
Most of the Earth’s atmosphere is made up of Nitrogen, followed by Oxygen. Together, these two elements make up just over 99% of the Earth’s atmosphere by volume. Next are argon (at a little less than 1%) and CO2 (at a little less than 0.1%). Everything else is less than this. As you can imagine, very small percentage changes in composition can have huge effects.
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