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Highest CO2 Dailies So Far In 2018: 412.37 (4/23); 411.21 (4/21)
Daily Records (by Year)
Highest-ever daily average CO2 | Mauna Loa Observatory
2018
Highest CO2 levels recorded so far in 2018:
412.37 ppm on April 23, 2018 (NOAA-ESRL)
411.21 ppm on April 21, 2018 (Scripps)
2017
412.63 ppm on April 26, 2017 (NOAA-ESRL)
411.27 ppm on May 15, 2017 (NOAA-ESRL)
2016
409.44 ppm on April 9, 2016 (Scripps)
409.39 ppm on April 8, 2016 (Scripps)
2015
404.84 ppm on April 13, 2015 (Scripps)
https://www.co2.earth/daily-co2