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Atmospheric CO2 reaches 400ppm milestone

May 14, 2013

On May 9, 2013, the daily mean concentration of carbon dioxide in the atmosphere of Mauna Loa, Hawaii, surpassed 400 parts per million (ppm) for the first time since measurements began in 1958. This marks an important milestone because Mauna Loa, as the oldest continuous carbon dioxide (CO2) measurement station in the world, is the primary global benchmark site.

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See the latest readings at “The Keeling Curve” web page:

http://keelingcurve.ucsd.edu/

 

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