Mauna Loa CO2

June 2024




June 2024
426.91 ppm TBD
June 2023 423.68 ppm TBD
June 2022 420.94 ppm TBD
Last Update: July 5, 2024 n/a
View Data: NOAA Scripps

Mauna Loa Observatory (MLO)  |  Atmospheric CO2
monthly mean concentrations  |  ppm = parts per million

Two independent records of CO2 changes are maintained in parallel at Mauna Loa.   A graph showing the two records together is available at the bottom of the Scripps CO2 Program website.  All-time monthly record highs for CO2 are recorded at the CO2 Records webpage. 

Use the tabs below to view the latest monthly CO2 data, charts and related links.