Odor emission rates and characteristics were evaluated at two commercial swine nurseries in Indiana during themonths of March, April, and May. The nurseries, housing 94 to 250 pigs, were mechanically ventilated with longterm manurestorage pits under wire floors. Incoming ventilation air at one of the nurseries was tempered in a heated hallway. Aneightmember odor panel evaluated odor concentration with a dynamic olfactometer and odor intensity and hedonic toneat full strength. The odor concentration of incoming ventilation air ranged from 7 to 85 odor units per cubic meter (OU m3)and averaged 18 OU m3. It ranged from 94 to 635 OU m3 and averaged 199 OU m3 in the ventilation exhaust air. The meanodor emission rates of the two nurseries were 18.3 and 62.5 OU s1 AU1 (1.1 and 2.7 OU s1 m2), respectively. The overallmean odor emission rate was 34 OU s1 AU1 (1.8 OU s1 m2). The measured emission rates are expected to be lower thanthose that follow stringent panel sensitivity requirements not currently required by olfactometry standards in the U.S.
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Lim et al. (2001) studied this question.