Directly measured and continuous records of atmospheric carbon dioxide (CO2) extend back to 1958. CO2 has also been measured in ancient air samples trapped in ice cores, and these records extend back hundreds of thousands of years. More recently, CO2 is being sampled by satellites providing global data to researchers.
Data for other stations and time periods are available at the listed URLs.
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|Monthly (blue) and annual (red) CO2 at Muana Loa (1958-2011). (Climate Data Guide; D. Shea)|
|CO2 for February, 2012 derived from Level 3 version 5.9 AIRS and MSU retrievals. Ascending and descending nodes were combined. Top: average CO2; middle: standard deviation of observations; bottom: the observation count. (Climate Data Guide; D. Shea)|
|400,000-year Vostok Record: Source: http://cdiac.ornl.gov/trends/co2/ice_core_co2.html|
National Center for Atmospheric Research Staff (Eds). Last modified 07 Nov 2013. "The Climate Data Guide: Overview: Carbon Dioxide (CO2) Data Sets." Retrieved from https://climatedataguide.ucar.edu/climate-data/overview-carbon-dioxide-co2-data-sets.