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This report presents the results of a study to measure the quantities and types of odorous substances at an intensive poultry farm at Lower Farm, Eastmoor, Derbyshire, where there have been odour complaints from local residents. The farm rears broiler chickens in four identical sheds; the study focussed on one shed - as a representative unit. The study measured the overall odour concentration inside the shed, and estimated the rate of odour emission from the shed. It also investigated if the odour was mainly due to one substance – because, if it was, then the relevant substance might conveniently have been targeted for odour control.