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The goal of this 11-month study was to evaluate the characteristics of ammonia (NH3) emission during a test of 1) soybean oil sprinkling (SOS), 2) misting of essential oils, and 3) misting of essential oils and water. Measurements were recorded every 60 s from August 2002 to July 2003 at two tunnel-ventilated swine finishing barns that were flushed at least 16 times daily with lagoon effluent. Ammonia concentrations were measured with a chemiluminescence analyzer by time-sharing it between the barns and ambient air. The treated barn with SOS resulted in 40% less NH3 emission than the control barn. The mean ( st. dev.) NH3 concentration and emissions were: 178.5 ppm (n=184) and 6222 g/d-AU (n=175), AU=animal unit=500 kg).