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Odor emissions from poultry and livestock operations in Ontario have raised significant public concerns. In this study, downwind odor measurement was conducted in Ontario poultry and livestock farms, and the data were analyzed. The odor measurements were taken during a seven week period in July and August, at 2 poultry farms, 6 dairy farms, and 6 swine farms in southern Ontario. Two assessors observed the dilution-to-threshold odor concentration using Nasal Ranger field olfactometers. The factors considered include animal species, weather conditions (i.e. wind speed, direction, temperature, and cloud cover), and distance to the odor source. The collected data were studied and the relationships of odor strength to individual factors were analyzed. As well, the significance of the contributing factors was investigated and ranked. Poultry and livestock farm odor should be considered as a complex system and it is suggested that multifactor analysis be performed. The ranking of the correlation of contributing factors to odor level can improve the understanding of odor systems and enhance the efficiency of odor evaluation and reduction techniques.