399.71 PPM CO2 concentration on May 7, 2013

Latest reading: 399.71 ppm

CO2 concentration on May 7, 2013

CHART: 1958 TO PRESENT

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Concentrations of the greenhouse gas carbon dioxide in the global atmosphere are approaching 400 parts per million (ppm) for the first time in human history

This website provides daily updates, analysis, and information on the state of climate

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The Scripps CO2 measurements at Mauna Loa have been supported for many years by the U.S. Department of Energy (DOE), and have more recently been supplemented by Earth Networks, a technology company that is collaborating with Scripps to expand the global GHG monitoring network.

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