File:Mauna Kea.jpg

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CO2 Measurements @Mauna Loa, Hawaii

• https://www.esrl.noaa.gov/gmd/ccgg/trends/

• https://www.esrl.noaa.gov/gmd/ccgg/trends/full.html

• https://scripps.ucsd.edu/programs/keelingcurve/

Highest Daily CO2 Records (by year) | Mauna Loa Observatory

Measurements are made by two independent CO2 monitoring programs (NOAA and Scripps) at the Mauna Loa Observatory in Hawaii about 3400 metres above sea level.

2019 (as of January 12, 2019)

413.45 ppm on January 12, 2019 (NOAA-ESRL)

411.14 ppm on January 7, 2019 (Scripps)

411.08 ppm on January 6, 2019 (Scripps)

2018

412.60 ppm on May 14, 2018 (Scripps)

412.45 ppm on May 14, 2018 (NOAA-ESRL)

412.37 ppm on April 23, 2018 (NOAA-ESRL)

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)