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Recent Global CO2 Trend

May 25:   409.78 ppm
May 24:   409.77 ppm
May 23:   409.76 ppm
May 22:   409.75 ppm
May 21:   409.74 ppm
Last Updated: May 26, 2019
Global CO2

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The figure shows daily averaged CO2 from four GMD 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. Thiese 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.