Background noise levels in the United Kingdom

A model that allows the prediction of background noise level, for certain combinations of type of area, time of day and nearest major noise source, is proposed. The model has been deduced from multiple regression analysis of 1353 measurements made by Open University students. The standard error of each prediction is 10·2 dB(A). The large standard error of the model indicates the difficulty of estimating background levels solely on the basis of such parameters as are suggested in BS 4142:1967. Within the limitations on the accuracy of the model, which are discussed, it may be concluded that the notional background level as calculated by using the British Standard “Method of Rating Industrial Noise Affecting Mixed Residential and Industrial Areas” will over-estimate the actual background in the great majority of situations.