Polychlorinated biphenyls (PCB) in the combustion gas of domestic refuse were measured at two incinerators. First, the measurement method was devised by examination of absorbent and capturing rates. The tests using several organic solvents showed that 10% glycerine solution yielded the best result. For a capturing device, between a flask and an absorption jar, a tube packed with glass wool was installed. The capturing rate of the tube was 83%, and together with the absorption jar, the total capturing rate was 96%, and in some cases 97.9%. This method was then applied to the combustion gas of incinerators. The PCB content in the gas was small, with the maximum measurement of 0.30 microgram/N cu m, which was captured in the tube; there was no trace in the absorbent.