Atmospheric Carbon Dioxide (CO2) levels, 1840-present

To see precise values, hover your mouse cursor over the red 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).

1958-present data is from ftp://aftp.cmdl.noaa.gov/products/trends/co2/co2_annmean_mlo.txt & ftp://aftp.cmdl.noaa.gov/products/trends/co2/co2_mm_mlo.txt (measurements at Mauna Loa Observatory, HI). 
1850-1958 data is from http://data.giss.nasa.gov/modelforce/ghgases/Fig1A.ext.txt (ice cores). 
1840-1850 CO2 data is from http://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/law/law_co2.txt (Law Dome ice cores, 75 year smoothed). 
 
We also have a similar graph for methane (CH4), and a combined graph with both CO2 and CH4.
 
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