Six deep bedded swine finishing production sites were surveyed for hydrogen sulfide, ammonia and odor concentrations. Each site was observed four different times with readings 6 times over a 36 hour period. Hydrogen sulfide, ammonia and odor were measured at the building edge and downwind 30 m (100 ft). Hydrogen sulfide and ammonia were measured 150 m (500 ft) downwind also. The site averages for hydrogen sulfide were found to range from 25 to 228 ppb at the building edge, 4 to 17 ppb 30 m (100 ft) downwind and 4 to 8 ppb 150 m (500 ft) downwind. Ammonia site averages were found to range from 2 to 11 ppm at the building edge, undetectable to 3 ppm downwind 30 m (100 ft) and undetectable at 150 m (500 ft). Odor threshold site averages ranged from 130 to 630 at the building and 80 to 500 at a point 30 m (100 ft) from the building. Single point hydrogen sulfide monitors were used 30 m (100 ft) from the building at the four compass points. The downwind monitor yielded weighted averages ranging from 0.8 to 8.1 ppb for the six sites. Analyzing this data by separating it by atmospheric stability classes did not appear to indicate a trend.