Estimate composition of the Earth's atmosphere

Composition of the Earth's dry atmosphere

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Source

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Release date

December 2021

Region

Worldwide

Survey time period

2021

Supplementary notes

Figures for nitrogen and oxygen originally given as a percentage and converted into parts per million. Totals may not add up to 1,000,000 due to rounding, as well as varying times when estimates were made (across many reputable sources, estimates for carbon dioxide and methane are much more recent (around 2014), while other estimates are based on figures from the 1980s). Follow these links for regularly updated figures for carbon dioxide and methane.
The source also states that water is highly variable, and H2O gas typically makes up around 1% of the atmosphere. Figures in the chart are for the so-called "dry atmosphere" only.

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