Mauna Loa CO2

October 2022




October 2022
415.78 ppm 415.31 ppm
October 2021 413.93 ppm 413.55 ppm
October 2020 411.51 ppm 411.12 ppm
Last Update: Nov. 5, 2022 Nov. 2, 2022
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.