This study compared GOSAT/TANSO-FTS thermal infrared (TIR) V1 and CONTRAIL CME CO₂ data in the upper troposphere and lower stratosphere. The TIR CO₂ averages agreed with the CME CO₂ averages within 0.1 and 0.5 % in the Southern and Northern Hemisphere. At northern low and middle latitudes, their agreements were worse in spring and summer. The negative bias there made the maximum of TIR data being lower than that of CME data, which leads to underestimating the amplitude of CO₂ seasonal variation.