The Purdue odor setback distance model is a tool that is used to calculate reasonable odor setbacks for existing and proposed livestock facilities in Indiana. The model has been used to resolve conflicts between livestock producers and neighbors in various situations. Phase I of the study funded by the Indiana Soybean Alliance had five objectives: 1) Identify individual sources and setback distances; 2) Provide economic setbacks based on odor exposure percentages; 3) Specify odor abatement methods; 4) Include dairy operations; and 5) Provide emission rates of various manure storage and treatment facilities.