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Climate · Data to 2025

Carbon dioxide in the atmosphere

CO₂ at Mauna Loa, Hawaii averaged 427.35 parts per million in 2025, up from 315.98 ppm when continuous measurements began in 1959. The rise in the latest year was 2.74 ppm.

Latest (2025)427.35 ppmMauna Loa CO₂
Change on previous▲ 0.6%vs 2024
Data points671 series
3003203403603804004204401960198020002020Mauna Loa CO₂Mauna Loa CO₂ 1959: 316Mauna Loa CO₂ 1960: 317Mauna Loa CO₂ 1961: 318Mauna Loa CO₂ 1962: 318Mauna Loa CO₂ 1963: 319Mauna Loa CO₂ 1964: 320Mauna Loa CO₂ 1965: 320Mauna Loa CO₂ 1966: 321Mauna Loa CO₂ 1967: 322Mauna Loa CO₂ 1968: 323Mauna Loa CO₂ 1969: 325Mauna Loa CO₂ 1970: 326Mauna Loa CO₂ 1971: 326Mauna Loa CO₂ 1972: 327Mauna Loa CO₂ 1973: 330Mauna Loa CO₂ 1974: 330Mauna Loa CO₂ 1975: 331Mauna Loa CO₂ 1976: 332Mauna Loa CO₂ 1977: 334Mauna Loa CO₂ 1978: 335Mauna Loa CO₂ 1979: 337Mauna Loa CO₂ 1980: 339Mauna Loa CO₂ 1981: 340Mauna Loa CO₂ 1982: 341Mauna Loa CO₂ 1983: 343Mauna Loa CO₂ 1984: 345Mauna Loa CO₂ 1985: 346Mauna Loa CO₂ 1986: 348Mauna Loa CO₂ 1987: 349Mauna Loa CO₂ 1988: 352Mauna Loa CO₂ 1989: 353Mauna Loa CO₂ 1990: 354Mauna Loa CO₂ 1991: 356Mauna Loa CO₂ 1992: 357Mauna Loa CO₂ 1993: 357Mauna Loa CO₂ 1994: 359Mauna Loa CO₂ 1995: 361Mauna Loa CO₂ 1996: 363Mauna Loa CO₂ 1997: 364Mauna Loa CO₂ 1998: 367Mauna Loa CO₂ 1999: 369Mauna Loa CO₂ 2000: 370Mauna Loa CO₂ 2001: 371Mauna Loa CO₂ 2002: 373Mauna Loa CO₂ 2003: 376Mauna Loa CO₂ 2004: 378Mauna Loa CO₂ 2005: 380Mauna Loa CO₂ 2006: 382Mauna Loa CO₂ 2007: 384Mauna Loa CO₂ 2008: 386Mauna Loa CO₂ 2009: 388Mauna Loa CO₂ 2010: 390Mauna Loa CO₂ 2011: 392Mauna Loa CO₂ 2012: 394Mauna Loa CO₂ 2013: 397Mauna Loa CO₂ 2014: 399Mauna Loa CO₂ 2015: 401Mauna Loa CO₂ 2016: 404Mauna Loa CO₂ 2017: 407Mauna Loa CO₂ 2018: 409Mauna Loa CO₂ 2019: 412Mauna Loa CO₂ 2020: 414Mauna Loa CO₂ 2021: 416Mauna Loa CO₂ 2022: 419Mauna Loa CO₂ 2023: 421Mauna Loa CO₂ 2024: 425Mauna Loa CO₂ 2025: 4273003504004501960198020002020Mauna Loa CO₂Mauna Loa CO₂ 1959: 316Mauna Loa CO₂ 1960: 317Mauna Loa CO₂ 1961: 318Mauna Loa CO₂ 1962: 318Mauna Loa CO₂ 1963: 319Mauna Loa CO₂ 1964: 320Mauna Loa CO₂ 1965: 320Mauna Loa CO₂ 1966: 321Mauna Loa CO₂ 1967: 322Mauna Loa CO₂ 1968: 323Mauna Loa CO₂ 1969: 325Mauna Loa CO₂ 1970: 326Mauna Loa CO₂ 1971: 326Mauna Loa CO₂ 1972: 327Mauna Loa CO₂ 1973: 330Mauna Loa CO₂ 1974: 330Mauna Loa CO₂ 1975: 331Mauna Loa CO₂ 1976: 332Mauna Loa CO₂ 1977: 334Mauna Loa CO₂ 1978: 335Mauna Loa CO₂ 1979: 337Mauna Loa CO₂ 1980: 339Mauna Loa CO₂ 1981: 340Mauna Loa CO₂ 1982: 341Mauna Loa CO₂ 1983: 343Mauna Loa CO₂ 1984: 345Mauna Loa CO₂ 1985: 346Mauna Loa CO₂ 1986: 348Mauna Loa CO₂ 1987: 349Mauna Loa CO₂ 1988: 352Mauna Loa CO₂ 1989: 353Mauna Loa CO₂ 1990: 354Mauna Loa CO₂ 1991: 356Mauna Loa CO₂ 1992: 357Mauna Loa CO₂ 1993: 357Mauna Loa CO₂ 1994: 359Mauna Loa CO₂ 1995: 361Mauna Loa CO₂ 1996: 363Mauna Loa CO₂ 1997: 364Mauna Loa CO₂ 1998: 367Mauna Loa CO₂ 1999: 369Mauna Loa CO₂ 2000: 370Mauna Loa CO₂ 2001: 371Mauna Loa CO₂ 2002: 373Mauna Loa CO₂ 2003: 376Mauna Loa CO₂ 2004: 378Mauna Loa CO₂ 2005: 380Mauna Loa CO₂ 2006: 382Mauna Loa CO₂ 2007: 384Mauna Loa CO₂ 2008: 386Mauna Loa CO₂ 2009: 388Mauna Loa CO₂ 2010: 390Mauna Loa CO₂ 2011: 392Mauna Loa CO₂ 2012: 394Mauna Loa CO₂ 2013: 397Mauna Loa CO₂ 2014: 399Mauna Loa CO₂ 2015: 401Mauna Loa CO₂ 2016: 404Mauna Loa CO₂ 2017: 407Mauna Loa CO₂ 2018: 409Mauna Loa CO₂ 2019: 412Mauna Loa CO₂ 2020: 414Mauna Loa CO₂ 2021: 416Mauna Loa CO₂ 2022: 419Mauna Loa CO₂ 2023: 421Mauna Loa CO₂ 2024: 425Mauna Loa CO₂ 2025: 427

Unit: ppm · Hover or tap points for values.

Show the numbers
PeriodMauna Loa CO₂
2025427.35
2024424.61
2023421.08
2022418.53
2021416.41
2020414.21
2019411.65
2018408.72
2017406.76
2016404.41
2015401.01
2014398.81
2013396.74
2012394.06
2011391.85
2010390.1
2009387.64
2008385.83
2007384.02
2006382.09
2005379.98
2004377.7
2003375.98
2002373.45
2001371.32
2000369.71
1999368.54
1998366.84
1997363.88
1996362.74
1995360.97
1994358.96
1993357.21
1992356.54
1991355.7
1990354.45
1989353.2
1988351.69
1987349.31
1986347.61
1985346.35
1984344.87
1983343.15
1982341.48
1981340.12
1980338.76
1979336.84
1978335.41
1977333.84
1976332.03
1975331.13
1974330.19
1973329.68
1972327.46
1971326.32
1970325.68
1969324.62
1968323.05
1967322.18
1966321.37
1965320.04
1964319.62
1963318.99
1962318.45
1961317.64
1960316.91
1959315.98