Daily CO2

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 Mauna Loa CO2

December 2019




Dec. 2019
411.76 ppm 411.85 ppm
Dec. 2018 409.07 ppm 409.23 ppm
Dec. 2017 406.81 ppm 406.75 ppm
Last Update: Jan. 7, 2020
Jan. 2, 2020
View Data: NOAA

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.