In this study investigated the gaseous N and CH4 losses in a deep-bedded hoop swine finishing system and associated composting system. Naturally ventilated livestock structures pose special problems for emission quantification, as inlet and outlet locations and flowrates vary with wind direction, speed, and temperature. This study focused on developing the state-of-the-art tracer ratio technique to quantify NH3, N2O, and CH4, emissions from naturally ventilated deep-bedded hoop structures. While this method has previously been used and is highly recommended by European researchers, our initial investigations demonstrated variable results, depending on downwind sampling time and location. Nonetheless, even with this variability, results indicate hoop structures can reduce methane emissions relative to other swine housing systems, ammonia emissions are comparable, and nitrous oxide emissions are elevated. Bedding management strategies offer the potential to further reduce emissions, both in the bedded pack and subsequent composting system. Outputs from this effort include four conference papers already submitted, with two journal articles and a Ph.D. dissertation (in Statistics) in preparation.