Data from March 1958 through April 1974 have been obtained by C. David Keeling.
* Estimate based off of previous reports.
CO2 expressed as a mole fraction in dry air, micromol/mol, abbreviated as ppm
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Global atmospheric concentration of carbon dioxide by decade 1880-2018
This statistic represents the average level of carbon dioxide in the atmosphere worldwide between the and 2018. In 2015, the level of CO2 in the atmosphere surpassed *** parts per million. Since the beginning of the first measurements in 1959, there has been a constant increase in concentration of CO2. In the early , the greenhouse gas rose about *** parts per million per year. Over the last ten years, it has been rising at about * parts per million per year. Before the Industrial Revolution began in the **** century, the global average level of carbon dioxide was around *** parts per million.
The global per capita emissions of carbon dioxide can be found here.
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National Oceanic and Atmospheric Administration. (March 12, 2019). Average level of carbon dioxide (CO2) in the atmosphere worldwide between the 1880 and 2018, by decade (in parts per million) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 22, 2026, from /statistics/280006/atmospheric-concentration-of-co2/
National Oceanic and Atmospheric Administration. "Average level of carbon dioxide (CO2) in the atmosphere worldwide between the 1880 and 2018, by decade (in parts per million)." Chart. March 12, 2019. ÌÇÐÄÆƽâ°æ. Accessed July 22, 2026. /statistics/280006/atmospheric-concentration-of-co2/
National Oceanic and Atmospheric Administration. (2019). Average level of carbon dioxide (CO2) in the atmosphere worldwide between the 1880 and 2018, by decade (in parts per million). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 22, 2026. /statistics/280006/atmospheric-concentration-of-co2/
National Oceanic and Atmospheric Administration. "Average Level of Carbon Dioxide (Co2) in The Atmosphere Worldwide between The 1880 and 2018, by Decade (in Parts per Million)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 12 Mar 2019, /statistics/280006/atmospheric-concentration-of-co2/
National Oceanic and Atmospheric Administration, Average level of carbon dioxide (CO2) in the atmosphere worldwide between the 1880 and 2018, by decade (in parts per million) ÌÇÐÄÆƽâ°æ, /statistics/280006/atmospheric-concentration-of-co2/ (last visited July 22, 2026)
Average level of carbon dioxide (CO2) in the atmosphere worldwide between the 1880 and 2018, by decade (in parts per million) [Graph], National Oceanic and Atmospheric Administration, March 12, 2019. [Online]. Available: /statistics/280006/atmospheric-concentration-of-co2/
