Mauna Loa CO2

January 2019




Jan. 2019

410.83 ppm

410.92 ppm


407.96 ppm

408.05 ppm

Jan. 2017

406.17 ppm

406.07 ppm

Last Update: Feb 5 2017
Feb 7 2019
View Data: NOAA  |  CO2.Earth 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

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


CO2 Past.  CO2 Present.  CO2 Future.