Atmospheric Methane (CH4) levels, 1840-present

To see precise values, hover your mouse cursor over the blue graph trace. (However, the ice core values are less accurate than the Mauna Loa measurements.)

Click here for a downloadable, bookmarkable image (except in Internet Explorer or Microsoft Edge, use PrtScn or static image).

1840-1992 data (in light blue) is from http://cdiac.ornl.gov/ftp/trends/atm_meth/EthCH498B.txt (ice cores), interpolated. 
1984-present data (in dark blue) is from ftp://aftp.cmdl.noaa.gov/products/trends/ch4/ch4_annmean_gl.txt (measurements at Mauna Loa Observatory, HI).
 
We also have a similar graph for carbon dioxide (CO2), and a combined graph with both CO2 and CH4.
 
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