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

December 2024:  425.40 ppm

December 2023:  421.86 ppm

Last updated: Jan 5, 2025

co2_trend_mlo 1224.png
co2_data_mlo 1224.png

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)

September 2024:  1936.64 ppb

September 2023:  1925.06 ppb

Last updated: Jan 5, 2025

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ch4_trend_all_gl 0924.png
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