Recent Global CO2 Trend

September 24:   419.77 ppm
September 23:   419.76 ppm
September 22:   419.75 ppm
September 21:   419.75 ppm
September 20:   419.74 ppm
Last Updated: September 25, 2023
Global CO2

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The figure shows daily averaged CO2 from four GML Atmospheric Baseline observatories; Barrow, Alaska (in blue), Mauna Loa, Hawaii (in red), American Samoa (in green), and South Pole, Antarctica (in yellow). The thick black lines represent the average of the smoothed seasonal curves and the smoothed, de-seasonalized curves for each of the records. These lines are a very good estimate of the global average levels of CO2. Details about how the smoothed seasonal cycle and trend are calculated from the daily data are available here.