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The Mauna Loa station is the oldest in the world to measure carbon dioxide.
CNN: CO2 levels hit new peak at key observatory
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But those monitoring stations aren't seen as a world mark like the one at Mauna Loa, Hawaii.
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The long-term measurements at Mauna Loa were started by a Scripps Institution of Oceanography scientist called Charles Keeling.
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When we started monitoring it at Mauna Loa in 1957, CO2 was growing at about 0.75 ppm annually.
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In 2012, monitoring stations in the Arctic measured 400 parts per million, but this is a new high at Mauna Loa.
CNN: CO2 levels hit new peak at key observatory
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Since scientists began measuring at Mauna Loa in 1958, the concentration of carbon dioxide has been increasing every year, NOAA said.
CNN: CO2 levels hit new peak at key observatory
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Located remotely from other sources of air pollution, Mauna Loa is commonly considered one of the most reliable places to measure concentrations of gases in the atmosphere.
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The Mauna Loa monitoring station is operated by the U.S. National Oceanic and Atmospheric Administration (NOAA) and sits at an altitude of about 12, 000 ft in the middle of the Pacific.
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For the first time, scientists measured an average concentration of atmospheric carbon dioxide of 400 parts per million in Mauna Loa, Hawaii, where the National Oceanic and Atmospheric Administration observatory is located, on Thursday.
CNN: CO2 levels hit new peak at key observatory
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Carbon dioxide levels in the atmosphere are currently the highest on record, according to preliminary data from the Earth Systems Research Laboratory at Mauna Loa in Hawaii where measurements of CO2 have been recorded for nearly half a century.
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