Atmospheric Methane (CH4) levels, 1840-present

To see precise methane 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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