Strategic noise maps are an essential tool for the evaluation of the exposure of the population to noise pollution and the elaboration of Action Plans. In this regard, since in situ measures are required for the elaboration or the calibration and validation of noise maps, the Noise European Directive considers the standard ISO 1996 as a reference. On the one hand, this standard establishes in its normative part some corrections as a function of the distance between the microphone and the rear

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... flective surface. On the other hand, it contains an Annex B (informa-tive) in which certain conditions are established for each case in order that the values obtained by in situ measurements are approximate to these corrections. This paper show a review of the scientific literature about this topic, in which an analysis of published results and a reflection about the accuracy of the strategic noise maps carried out under the European Noise Directive are made.