One approach to odor abatement at swine facilities is to provide adequate buffer zone or separation distance from neighbors. Use of a nutrient (nitrogen and phosphorus) balance to determine land requirements appropriate for the facility size and type of manure management system will provide considerable separation distance. Procedures and examples for determining a phosphorus and nitrogen balance and resulting theoretical minimum separation distances were presented. Results of field odor concentration measurements at two swine operations of differing size and type were presented, along with the required distances to reach near-background odor levels.