Mauna Loa CO2

August 2023




August 2023
419.68 ppm TBD
August 2022 417.15 ppm 416.76 ppm
August 2021 414.42 ppm 414.34 ppm
Last Update: Sept. 5, 2023 July 10, 2023
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.