Six Decades of Carbon Dioxide Concentration in the Atmosphere

CO2 concentration in parts per million* (ppm). Each line represents one decade, from 1958 to 2019.

1958 - 1959

1960 - 1969

1970 - 1979

1980 - 1989

1990 - 1999

2000 - 2009

2010 - 2019

1958 - 1959

1960 - 1969

1970 - 1979

1980 - 1989

1990 - 1999

2000 - 2009

2010 - 2019

*The mole fraction of CO2, expressed as parts per million (ppm) is the number of molecules of CO2 in every million molecules of dried air (water vapor removed).