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Broiler production results in the production of ammonia, and at high concentrations, ammonia can affect bird performance, and hence, productivity. When released into the environment through ventilation, ammonia can adversely affect public health and the environment. Because of its environmental and health impacts, ammonia emissions from animal feeding operations may be regulated by the EPA. Acidifying amendments have been shown to be effective in reducing ammonia emissions from poultry operations. The purpose of this study is to evaluate in-house ammonia concentrations and emissions from four commercial heavy-broiler houses in eastern North Carolina receiving four levels of PLT® (a commercial amendment): control (0.37 – 0.49 kg/m2 center brood area), low (0.37 – 0.49 kg/m2 whole house), medium (0.73 kg/m2 whole house), and high (>0.73 kg/m2 whole house). Ammonia concentrations were measured with acid scrubbers and ammonia emissions were calculated from exhaust ammonia concentrations and ventilation volumes. Based on monitoring of three flocks (September 2007 to May 2008), in-house ammonia-N concentrations decreased with increasing PLT application rates. A medium application rate was adequate for maintaining ammonia levels at or below 25 ppm for 9-wk grow-out period during the spring. Based on data from three flocks, ammonia emission factors (only grow-out) for the control, low, medium, and high treatments were 1.06, 1.12, 0.97, and 0.92 g/bird-d, respectively. These emission factors are mostly higher than those reported in the literature mainly because they represent heavier (>4 kg) and older (9-wk) birds fed a higher protein diet. Acid scrubbers proved to be suitable for measuring time-averaged ammonia concentrations for a wide range of values. Emissions data will be collected for four more flocks and PLT impacts on bird performance and energy use will also be quantified.