Mauna Loa CO2

March 2019




March 2019

411.97 ppm

411.97 ppm


409.41 ppm

409.25 ppm

March 2017

407.22 ppm

407.06 ppm

Last Update: Apr 12 2019
Apr 4 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.