The carbon dioxide gas was injected into Ar induction thermal plasmas to investigate the plasma-quenching efficiency of CO
2 and N
2. In the experiments, C
2 molecular band spectra and N
2+ molecular spectra were found. Theoretical calculation of the radiation intensity for C
2 Swan system and N
2+ first negative system was carried out as functions of excitation temperature, rotational temperature and vibrational temperature. The fitting technique between the experimental and theoretical radiation intensities of the C
2 Swan spectra and N
2+ spectra was used for determination of rotational and vibrational temperatures. It was found that vibrational temperature was decreased with increasing CO
2 admixture ratio into Ar thermal plasmas, which may be related with a decreased electron temperature.
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