https://spaceref.com/science-and-exploration/using-rusalka-on-the-iss-to-measure-methane-and-co2-in-earths-atmosphere-2/
Using RUSALKA on the ISS to Measure Methane and CO2 In Earth's Atmosphere - SpaceRef
May 24, 2013 - Space news and reference site.
co2 in earth s atmosphere