Estatísticas para Through the implementation of control measures, through different engineering and management techniques, a considerable reduction of the average level of environmental noise outside the walls can be achieved. In this sense, a company that manufactures microwave ovens, the object of this study, developed and implemented control measures that led to the reduction of the mean sound pressure level emitted by one of its production processes, with an industrial plant installed in Manaus-AM. Such noisy source was chosen because it is close to the boundary with the boundary of the surrounding company, which was receiving noise in a location above 60 dB (A), which is the criterion level of evaluation of the night time, serving as the limit of tolerance in accordance with the requirements of Conama Resolution no. 01/90 and NBR 10.151 / 2000. Thus, after the intervention was completed, new environmental assessments were carried out, which made it possible to compare the values obtained before the change was executed, with the results of the evaluations carried out after this execution. Therefore, it was observed that the limits of tolerance in force in Brazil have been met, showing that the result of this improvement can be considered effective, both technically and legally, always aiming to prevent auditory discomfort in the community, in this case, an industrial company around the establishment under study, as well as, hearing loss in the workers of this industrial establishment.