The Most Current CO2 Data on Earth | August 2015

* Scripps annual CO2 data is calcuated by CO2Now using Scripps monthly CO2 data. 
** Averages determined by Scripps and NOAA cover a different 24-hour time period due to time zone differences. 

The Global Monitoring Division of NOAA-ESRL operates staffed atmospheric baseline observatories at the following locations:

• Barrow, Alaska
• Trinidad Head, California
• Mauna Loa, Hawaii
• American Samoa
• South Pole, Antarctica
• Summit, Greenland

Source:  NOAA-ESRL GMD

The NOAA-ESRL-GMD CCGG (carbon cycle greenhouse gas group) cooperative air sampling network effort began in 1967 at Niwot Ridge, Colorado (USA). Today, the network is an international effort which includes regular discrete samples from NOAA-ESRL baseline observatories, cooperative fixed sites, and commercial ships.

Air samples are collected through the NOAA-ESRL global air sampling network, including a cooperative program for the carbon gases which provides samples from about 100 global clean air sites, including measurements from ship routes at 5 degree latitude intervals.  

Air samples are collected approximately weekly and analyzed in Boulder, Colorado (USA). 

Sources:  NOAA-ESRL CCGG  |  High-Resolution PDF