This paper presents a methodology to quantitatively measure H 2 S, SO 2 and NO 2 fractions in gaseous CO 2 by using broadband absorption spectroscopy at 1 and 40 bar. The mole fractions of binary-and 3-component mixtures of H 2 S, SO 2 and NO 2 in CO 2 with known fractions ranging from 35-250 ppm are successfully derived from the measured absorption spectra. The difference between the fitted and experimental mole fractions is less than 10% for all studied mixtures. The results successfully demonstrate that low fractions of H 2 S, SO 2 and NO 2 in gaseous CO 2 can be accurately measured at pipeline conditions by using broad band absorption spectroscopy.