Mauna Loa CO2

October 2018




Oct. 2018

406.00 ppm

406.00 ppm

Oct. 2017

403.63 ppm

403.64 ppm

Oct. 2016

401.59 ppm

401.50 ppm

Last Update: Nov 5, 2018
Nov 5, 2018
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.