Road noise — Areas where limit values are exceeded, over 24 hours (Lden indicator)

**Strategic Noise Mapping** Data produced by Impédance ingénierie on behalf of the metropolis Aix-Marseille Provence On the map, the geographical shapes have been simplified in order to optimise the display of the layer. The entire layer, without simplifying geographical shapes, is available in SHAPE format in the Alternative Export/Exports tab. The symbology associated with the noise map is available in the attached section, in QGIS format. ** ** Road noise according to the Lden indicator for type C maps on the Aix-Marseille Provence Metropolis. Results of calculations of acoustic modelling. Type C map identifies areas where limit values are exceeded. The Lden indicator (for Level day-evening-night) represents the weighted average noise level during the day by giving a stronger weight to the noise produced in the evening (18-22h) (+ 5 dB(A)) and overnight (22h-6h) (+ 10 dB(A)) to take into account the increased sensitivity of individuals to noise during these two periods.