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Atmospheric CO₂ at Mauna Loa (annual mean)

How it's computed
Values exactly as published by the source (rounded).
Source
NOAA Global Monitoring Laboratory, Mauna Loa · link
As of
2025 · fetched 24 Oct 2026

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67 rows
Year / dateCO₂ (ppm) (ppm)
1959315.98
1960316.91
1961317.64
1962318.45
1963318.99
1964319.62
1965320.04
1966321.37
1967322.18
1968323.05
1969324.62
1970325.68
1971326.32
1972327.46
1973329.68
1974330.19
1975331.13
1976332.03
1977333.84
1978335.41
1979336.84
1980338.76
1981340.12
1982341.48
1983343.15
1984344.87
1985346.35
1986347.61
1987349.31
1988351.69
1989353.2
1990354.45
1991355.7
1992356.54
1993357.21
1994358.96
1995360.97
1996362.74
1997363.88
1998366.84
1999368.54
2000369.71
2001371.32
2002373.45
2003375.98
2004377.7
2005379.98
2006382.09
2007384.02
2008385.83
2009387.64
2010390.1
2011391.85
2012394.06
2013396.74
2014398.81
2015401.01
2016404.41
2017406.76
2018408.72
2019411.65
2020414.21
2021416.41
2022418.53
2023421.08
2024424.61
2025427.35
Data behind this figure