Mauna Loa CO2

December 2016




December 2016

 404.48 ppm

404.55 ppm

December 2015

 401.85 ppm

401.89 ppm

December 2014

398.91 ppm

398.71 ppm

Last Update: January 6, 2017
January 8, 2017
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.