“…The ventilation air from animal production facilities contains a variety of chemical compounds, relatively high water content and high densities of particulate matter. This includes a great number of volatile organic compounds (VOCs) that are emitted in agricultural buildings from, e.g., silage, manure and the animals themselves (Feilberg et al, 2010;Hafner et al, 2013;Hansen et al, 2012;Ngwabie et al, 2008;Shaw et al, 2007;Yuan et al, 2017). Several NH 3 analyzers are sensitive to water vapor and other gasses (Bobrutzki et al, 2010;Huszár et al, 2008;Ni and Heber, 2008;Rom and Zhang, 2010;Rosenstock et al, 2013).…”