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Atmospheric Carbon Dioxide (CO 2 ) levels, 1800–present

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Options linear log scale evenly-spaced log scale

(hover mouse over options for detailed explanations)

To see precise values, hover your mouse cursor over the red graph trace. (However, all values are shown with one more significant digit than is warranted by the precision of the measurements, and the ice core values are less accurate than the Mauna Loa measurements.) Click here for a downloadable, bookmarkable image (except in Internet Explorer or Microsoft Edge, use PrtScn).

All of the CO 2 figures are annual averages.

We also have a similar graph for methane (CH 4 ), and a combined graph with both CO 2 and CH 4 .