Mauna Loa CO2

April 2024




April 2024
426.57 ppm TBD
April 2023 423.37 ppm TBD
April 2022 420.19 ppm TBD
Last Update: May 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.