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Global atmospheric concentration of carbon dioxide 1959-2019

The atmospheric level of carbon dioxide has been steadily rising over the last decades. Emissions of carbon dioxide largely come from human activities such as burning fossil fuels and deforestation. In 2019, carbon dioxide levels reached 411 parts per million, in comparison to 1960 levels which stood at about 317 parts per million.

Historic average carbon dioxide (CO2) levels in the atmosphere worldwide from 1959 to 2019 (in parts per million)*

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Sources

Release date

2020

Region

Worldwide

Survey time period

1959 to 2019

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.

* Preliminary.
Select Mauna Loa CO2 annual mean data to access data.

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