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Recent Global CO2 Trend

September 17:   408.14 ppm
September 16:   408.14 ppm
September 15:   408.13 ppm
September 14:   408.12 ppm
September 13:   408.11 ppm
Last Updated: September 18, 2018
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 line represents the average of the smoothed, de-seasonalized curves for each of the records. This trend line is a very good estimate of the global average levels of CO2. Details about how the trend is calculated from the daily data is available here.