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 & (measurements at Mauna Loa Observatory, HI). 
1850-1958 data is from (ice cores). 
1840-1850 CO2 data is from (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.