Recent Global CO2 Trend

September 17:   410.60 ppm
September 16:   410.59 ppm
September 15:   410.59 ppm
September 14:   410.58 ppm
September 13:   410.57 ppm
Last Updated: September 18, 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. 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.