An automated gas chromatograph (GC) has been developed for the analysis of the atmospheric concentrations of dimethyl sulfide (DMS) and carbon disulfide (CS 2 ) at the Australian Baseline Air Pollution Station Cape Grim. The system comprises cryogenic concentration of DMS and CS 2 from 4 1 of air after oxidant and water removal, capillary gas chromatography, and sulfur chemiluminescence detection. Calibration is by injection of a known quantity of methylethyl sulfide (MES) as an internal standard into the sampled air stream. Detection and quantitation of DMS and CS 2 in the range of 5 to 500 ng/m 3 , typical of the annual concentration variation of DMS and CS 2 at Cape Grim, has been achieved with a sampling frequency of 2 samples per hour and a detection limit of 10 pg S per compound. A comparison of results from the automated GC and those obtained by a gold-coated glass wool trapping method with atomic emission detection is presented.