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Animal feeding operations emit odors that can become nuisances to downwind neighbors. Many commercial odor abatement products are being marketed to animal feeding operations with little scientific information on performance of these additives. Four experiments were conducted to evaluate the effects of moisture content and abatement additives on odor emissions from simulated feedlot pen surfaces and storage ponds/lagoons. In all four experiments, odor emissions were measured as detection threshold (DT), intensity, and hedonic tone (HT). In experiment 1, odor emissions were monitored for nine days from simulated feedlot pen surfaces at constant wet basis moisture contents (MC) of 12%, 20%, 40%, and 60%. Odor emission rate (OER) and intensity were highest and hedonic tone lowest (least pleasant) at 60% MC. In experiment 2, odor emissions were measured from simulated pen surfaces for nine days to which two commercial additives, BioZyme and humate, were applied. By day-9 all treatments had similar OERs. In experiment 3, odor emissions were measured from simulated pen surfaces for nine days to which three commercial additives, BioZyme, humate, and BAT507, were applied. None of the additives had much affect on odor emissions. In experiment 4, odor emissions were monitored for five months from simulated lagoons to which three commercial additives, BioZyme, Martin BioChem, and EnviroLagoon, were applied. All three additives had higher OERs and lower HTs than the control, indicating they were not effective in reducing odors. It was evident from this research that moisture content affected odor emissions from simulated feedlot surfaces, however none of the additives were able to satisfactorily control odor emissions.