Weekly means for atmospheric CO2 originate from the NOAA Earth System Research Laboratory (ESRL) and its Mauna Loa Observatory in Hawaii.


Weekly CO2

  Mauna Loa Observatory | NOAA-ESRL



Atmospheric CO2

Last Week

November 24 - 30, 2019

410.71 ppm

1 Year Ago

November 24 - 30, 2018

408.42 ppm

10 Years Ago

November - 24 - 30, 2009

386.51 ppm

  Data Updated:  December 1, 2019
  NOAA dataset: Web + .txt

weekly mean concentrations  |  ppm = parts per million


NOAA-ESRL and Scripps CO2 provide continually-updated graphics with daily and weekly data points plotted over multiple time periods.  Use the tabs below to view these graphics as well as links to the NOAA and Scripps websites.

Recent data is preliminary.  NOAA-ESRL is the only weekly dataset with values updated in real time.  Scripps CO2 posts a weekly CO2 dataset that is updated less frequently.


CO2 Past.  CO2 Present.  CO2 Future.