Global atmospheric concentration of carbon dioxide 1990-2024, by month

Average monthly carbon dioxide (CO₂) levels in the atmosphere worldwide from 1990 to 2024

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Release date

2024

Region

Worldwide

Survey time period

January 1990 to April 2024

Supplementary notes

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.

Figures for the past year are preliminary.
Due to the eruption of the Mauna Loa Volcano, measurements from Mauna Loa Observatory were suspended as of Nov. 29. Observations starting in December 2022 are from a site at the Mauna Kea Observatories, approximately 21 miles north of the Mauna Loa Observatory.

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