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Which gas makes up over 75 of earth's atmosphere?

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By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. read more

The Earth's atmosphere is primarily made up of nitrogen, oxygen and argon, but it includes trace gases in smaller amounts such as neon, helium, carbon dioxide, methane, nitrous oxide and ozone. The most abundant gases in the atmosphere are nitrogen at 78 percent and oxygen at 21 percent, while the trace gases methane, neon and helium make up around one-tenth of 1 percent of the atmosphere. read more

The remaining gases combined make up just one percent of the atmosphere. The largest of these is argon, but there are also variable gases like carbon dioxide, which is fourth on the list. Carbon dioxide accounts for about 0.038 percent of the gases in the atmosphere. read more

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