NOAA's atmospheric and space observatory, at 3400 meters on the northeast flank of Mauna Loa volcano in Hawaii. The observatory consists of 10 buildings from which up to 250 different atmospheric parameters are measured. Measuring carbon dioxide at this location begun in 1958 at the request of Charles David Keeling of Scripps Oceanographic Institution, has created the longest continuous record of atmospheric CO2 concentrations available in the world. Air is collected continuously near the top of
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