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Abstract. Odor and gaseous emissions from the swine industry are of concern for the well-being of humans and livestock. Additives applied to the swine manure surface are popular, marketed products to solve this problem and are relatively inexpensive and easy for farmers to use. The objective of this research was to evaluate two manure additive prototypes (in liquid and powder form at two dosages (100 ppm & 500 ppm) on their effectiveness in mitigating H₂S, NH₃, CO₂, and CH₄ emitted from stored swine manure over an 8-week period. A pilot-scale setup was to simulate a deep pit manure storage was used for testing in triplicates for each treatment. The initial treatment dose on Day 1 was followed by gas emissions measurement twice per week. Emissions from treated and untreated manure were compared using ANOVA and Student T-test statistical analyses. No statistically significant emissions reductions were found during the 59 days of the trial for the four treatments tested for H₂S, NH₃, CO₂, and CH₄.