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By volume it is nitrogen.
Nitrogen form ~ 79%
Oxygen forms ~ 20%
The remaing 1% is composed of water vapour, carbon dioxide, methane, ammonia, sulphur dioxide, nitrogen dioxide, and the noble(inert) gases.
Although, humans live in 'fear and trembling' on the level of carbon dioxide in the atmopsphere, it is actually extremely low, by volume, compenent of the atmosphere.
lenpollock
Wiki User
∙ 16y agoIf by "main ingredient", you mean the substance that comprises the largest percentage of the volume of the earth's atmosphere, the answer is Nitrogen, specifically the N2 molecule, comprising about 78.1% of the volume (and 75.3% of the weight) of the earths' atmosphere.
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