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Atmospheric Greenhouse Gases
Trends in Atmospheric Carbon Dioxide
Monthly CO2 Average at Maunakea Observatories  (NOAA Data Source)

August 2023:  419.68 ppm

August 2022:  417.15 ppm

Last updated: Sep 5, 2023

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History of atmospheric carbon dioxide from 800,000 years ago until the end of the most recent GLOBALVIEW+ CO2 collection

Source: NOAA Global Monitoring Laboratory

Trends in Atmospheric Methane
Global CH4 Monthly Means   (NOAA Data Source)

May 2023:  1922.26 ppb

May 2022:  1907.80 ppb

Last updated: Sep 5, 2023

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