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A preliminary study was conducted into the emissions of N2O, NH3, CH4 and aerosols at two manure aeration treatment plants. Aim of the study was to determine to what extent harmful substances can emit from an aeration unit for the production of ammonia and odour-free liquid. Measurements were done according the dynamic box method for determining the emissions of gases and concentration measurements were carried out for aerosols (bacteria and endotoxins). It was determined that the emissions of ammonia were virtually zero (measured 0.087 g per m3 manure). Greenhouse gas emissions (CH4 and N2O) were also low and barely measurable in our measurement setup. Based on our measurements, the emission can vary between 0 and 39 g CO2 equivalents per m3 of slurry. For fattening pigs, a total CO2 footprint of 1 700 kg CO2 equivalents per animal place is assumed. Also,concentrations of bacteria E Coli, Enterococcus, and Sulphide reducing Clostridia (SSRC) were below (E Coli and Enterococcus) detection limit or low (SSRC). Endotoxin concentrations above the surface of the aeration tank were scarcely higher than the advice value for outside air of 30 EU/m3.