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Research tests marketed products for efficacy in mitigating emissions of targeted gases. Jacek Koziel, Baitong Chen, Daniel Andersen, David Parker, Andrzej Bialowiec, Chumki Banik, Myeongseong Lee, Samuel O'Brien, Hantian Ma, Zhanibek Meiirkhanuly, Jisoo Wi, Peiyang Li, Iowa State University | Feb 02, 2021 The United States is one of the top 3 pork producting countries in the world. While the pork industry stimulates the economy and generates jobs, it also generates odor and gaseous emissions potentially affecting the air quality in surrounding communities. Manure additives are marketed to mitigate odor and emissions. They are easy to apply to manure (e.g., periodically poured into the manure pit) without changing the current storage structures. To date, however, there was very little scientific data on how these marketed products perform in mitigating gaseous emissions from swine manure. The last major odor product comparison study was carried out over two decades ago, and new products have been introduced since then.