Mauna Loa CO2

January 2020




Jan. 2020
413.40 ppm 413.37 ppm
Jan. 2019 410.83 ppm 410.92 ppm
Jan. 2018 407.96 ppm 408.05 ppm
Last Update: Feb. 5, 2020
Feb. 6, 2020
View Data: NOAA

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

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


CO2 Past.  CO2 Present.  CO2 Future.