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The world's latest data for atmospheric CO2 as measured at the Mauna Loa Observatory in Hawaii. This is where high-precision CO2 monitoring was started in March 1958 by Dr. Dave Keeling of the Scripps Institution of Oceanography.
The Mauna Loa Observatory is a remote location where CO2 is well mixed in the atmosphere, more than two miles above sea level.
Current CO2 level in parts per million
This page was last modified on 04-Jan-2012