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This paper summarizes results obtained from eight different swine farms that were monitored continuously for hydrogen sulfide (H2S) during different periods of time in 1999, 2000, and 2001. Continuous measurements of H2S were carried out with single point monitors, which use a photo-optic system to measure gas concentrations based on 15- minutes averages. Weather parameters, including rainfall, air temperature, relative humidity, wind speed and direction, and solar radiation were also monitored. H2S concentrations as high as 450 ppb were recorded about 5 m downwind of a deep-pitted finishing barn. On the other hand, average H2S concentrations measured about 15 m from deep-pitted wean-tofinish barns were between 4 and 6 ppb only. Manure storages were found to cause a larger impact on ambient H2S than animal barns. Data from nursery farms showed lower H2S concentrations than finishing farms, but storage basins were covered with straw or natural crust. A distinct diurnal variation in ambient H2S was reasonably well correlated with air temperature and relative humidity.