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How much has carbon dioxide in the air risen since 1959?

The annual mean rose from 316 ppm in 1959 to 427 ppm in 2025, and first topped 400 ppm in 2015.

What does this axis measure?
What does this axis measure?
How much has carbon dioxide in the air risen since 1959?: 40 points, a line chart.
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CO₂ concentration (ppm)
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Year
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What's going on here

The chart shows the yearly average concentration of carbon dioxide in the air, measured in parts per million (ppm), from 1959 to 2025.

Where the data comes from

NOAA Global Monitoring Laboratory, with the Scripps Institution of Oceanography, at gml.noaa.gov. Licence: public domain (U.S. government work; citation requested).

The data: 40 points
YearCO₂ concentration (ppm)
1959315.98
1961317.64
1962318.45
1964319.62
1966321.37
1967322.18
1969324.62
1971326.32
1973329.68
1974330.19
1976332.03
1978335.41
1979336.84
1981340.12
1983343.15
1984344.87
1986347.61
1988351.69
1989353.2
1991355.7
1993357.21
1995360.97
1996362.74
1998366.84
2000369.71
2001371.32
2003375.98
2005379.98
2006382.09
2008385.83
2010390.1
2011391.85
2013396.74
2015401.01
2017406.76
2018408.72
2020414.21
2022418.53
2023421.08
2025427.35
Source
NOAA Global Monitoring Laboratory (with Scripps Institution of Oceanography)
Licence
Public domain (U.S. government work; citation requested)
Read
2026-09-27
Drawn
40 points as the puzzle showed them · line
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