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Global atmospheric concentration of carbon dioxide 1959-2021

Historic average carbon dioxide (CO2) levels in the atmosphere worldwide from 1959 to 2021 (in parts per million)*

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Release date




Survey time period

1959 to 2021

Supplementary notes

Data from March 1958 through April 1974 have been obtained by C. David Keeling.
CO2 expressed as a mole fraction in dry air, micromol/mol, abbreviated as ppm. Data has been measured at Mauna Loa Observatory, Hawaii as it constitutes the longest record of direct carbon dioxide measurements in the atmosphere.

Select Mauna Loa CO2 annual mean data to access data.

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Statistics on "Emissions worldwide"

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