From the eight swine facilities studied [locations not given], power functions were found to be an appropriate description of the pattern of downwind odour transport for both swine buildings and manure storage lagoons and tanks. The coefficients of correlation for the power regressions ranged from 0.75 to 0.87. It was found that swine buildings have the potential of generating more odour than manure storage facilities such as lagoons and tanks and thus could be the major odour sources, causing downwind odour nuisance. Therefore, maintain clean buildings should be highly recommended as swine producers’ best management practice. For earthen basins, the odour strength was reduced by 80% at about 250-m distance from the source, while for the swine building, a 50% of reduction in odour strength was observed at the same distance. The study did not show any advantages of using lagoons over concrete (or steel) manure tanks in terms of reducing downwind odour concentrations. Land application of manure did not cause persistent downwind odour problems.