Climate TrendsAtmospheric CO₂ at Mauna Loa, every year since 1959
Last updated:
| Year | CO₂ | Change |
|---|---|---|
| 2025 | 427.35 ppm | +2.74 |
| 2024 | 424.60 ppm | +3.52 |
| 2023 | 421.08 ppm | +2.55 |
| 2022 | 418.53 ppm | +2.11 |
| 2021 | 416.41 ppm | +2.20 |
| 2020 | 414.21 ppm | +2.56 |
| 2019 | 411.65 ppm | +2.93 |
| 2018 | 408.72 ppm | +1.96 |
| 2017 | 406.76 ppm | +2.35 |
| 2016 | 404.41 ppm | +3.40 |
| 2015 | 401.01 ppm | +2.20 |
| 2014 | 398.81 ppm | +2.07 |
| 2013 | 396.74 ppm | +2.68 |
| 2012 | 394.06 ppm | +2.20 |
| 2011 | 391.85 ppm | +1.75 |
| 2010 | 390.10 ppm | +2.46 |
| 2009 | 387.64 ppm | +1.81 |
| 2008 | 385.83 ppm | +1.81 |
| 2007 | 384.03 ppm | +1.93 |
| 2006 | 382.09 ppm | +2.11 |
| 2005 | 379.98 ppm | +2.29 |
| 2004 | 377.70 ppm | +1.71 |
| 2003 | 375.98 ppm | +2.53 |
| 2002 | 373.45 ppm | +2.13 |
| 2001 | 371.32 ppm | +1.61 |
| 2000 | 369.71 ppm | +1.17 |
| 1999 | 368.54 ppm | +1.70 |
| 1998 | 366.84 ppm | +2.96 |
| 1997 | 363.88 ppm | +1.13 |
| 1996 | 362.74 ppm | +1.78 |
| 1995 | 360.97 ppm | +2.01 |
| 1994 | 358.96 ppm | +1.74 |
| 1993 | 357.22 ppm | +0.67 |
| 1992 | 356.54 ppm | +0.84 |
| 1991 | 355.70 ppm | +1.25 |
| 1990 | 354.45 ppm | +1.25 |
| 1989 | 353.20 ppm | +1.51 |
| 1988 | 351.69 ppm | +2.38 |
| 1987 | 349.31 ppm | +1.70 |
| 1986 | 347.61 ppm | +1.26 |
| 1985 | 346.35 ppm | +1.49 |
| 1984 | 344.87 ppm | +1.71 |
| 1983 | 343.15 ppm | +1.67 |
| 1982 | 341.48 ppm | +1.36 |
| 1981 | 340.12 ppm | +1.36 |
| 1980 | 338.76 ppm | +1.93 |
| 1979 | 336.84 ppm | +1.42 |
| 1978 | 335.42 ppm | +1.57 |
| 1977 | 333.84 ppm | +1.82 |
| 1976 | 332.03 ppm | +0.90 |
| 1975 | 331.13 ppm | +0.93 |
| 1974 | 330.19 ppm | +0.51 |
| 1973 | 329.68 ppm | +2.23 |
| 1972 | 327.46 ppm | +1.14 |
| 1971 | 326.32 ppm | +0.64 |
| 1970 | 325.68 ppm | +1.06 |
| 1969 | 324.62 ppm | +1.57 |
| 1968 | 323.05 ppm | +0.87 |
| 1967 | 322.18 ppm | +0.81 |
| 1966 | 321.37 ppm | +1.33 |
| 1965 | 320.04 ppm | +0.42 |
| 1964 | 319.62 ppm | +0.63 |
| 1963 | 318.99 ppm | +0.54 |
| 1962 | 318.45 ppm | +0.81 |
| 1961 | 317.64 ppm | +0.74 |
| 1960 | 316.91 ppm | +0.93 |
| 1959 | 315.98 ppm | – |
Method
Temperature: GISTEMP v4 Land-Ocean Temperature Index (global means), anomalies relative to 1951–1980 in °C; the annual value is NASA’s January–December mean. CO₂: NOAA GML monthly mean mole fraction at Mauna Loa in ppm; annual values are averages of the available months (only complete years are ranked). Recent values may be revised by the data providers.
About this page
Annual mean carbon dioxide concentration at Mauna Loa Observatory (NOAA) since 1959, with yearly increase and chart.