Emision data for hydrogen sulfide, ammonia and odour were measured from a total of seven farm representing 1 poultry, 1 dairy and 5 swine operations. The process consisted of one day sampling at each site with samples being collected every two hours enusring a total of seven sets of data were collected during a 12 hour sampling period. Accoridng to this study, the nursery building has the highest emission rates for odour and hydrogen sulfide. The naturally ventilated swine finishing building has the highest ammonia emsission rate. The data also showed there was no significant differences in terms of the levels of ammonia nd hydrogen sulfide in the daily course for all the animal facilites studied. Ventilation rates play an important role in determining the emission rates of aerial poolutants from animal buildings.