NOTICE (August 2016): CDIAC as currently configured and hosted by ORNL will cease operations on September 30, 2017. Data will continue to be available through this portal until that time. Data transition plans are being developed with DOE to ensure preservation and availability beyond 2017.

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Atmospheric CO2 Records from Sites in the Main Geophysical Observatory Air Sampling Network

Main Geophysical Observatory monitoring sites

Map showing location of the Main Geophysical Observatory air sampling network sites