Some swine facilities utilize one or more odor reduction or technologies to reduce odor emission such as biofilters, pit additives and diet manipulation. The odor abatement effectiveness factor (AE) is used to account for the reduction of odor emission from buildings. The allowable reduction of odor emission ranges from 0 to 70%.
The odor abatement factor for outside liquid manure storage AS is used to characterize the reduction in odor emission as compared to open liquid storage. Surface aeration of anaerobic lagoons is an example of odor reducing technology.