Mauna Loa CO2

August 2018




Aug. 2018

406.99 ppm

407.10 ppm

Aug. 2017

405.07 ppm

405.24 ppm

Aug. 2016

402.25 ppm

402.24 ppm

Last Update: September 5, 2018
September 4, 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.