Dataset Direct Download Service (WFS): Areas where the noise limit values are exceeded on the Charente-Maritime (areas of type C — index of type LN) Prefectural Decree No 18-1536 of 24 July 2018

These maps also referred to as “type c maps” represent the parts of territories likely to contain buildings exceeding the limit values referred to in Article L571-6 of the Environmental Code and laid down by Article 7 of the Order of 4 April 2006. Layer carried out by GIS workshop (April 2018) by compiling type C noise zones related to road infrastructure (CEEREMA report on "Strategic noise maps of the Charente-Maritime department (017) Major infrastructure not granted; Deadline 3: 2017-2022") and motorway ("Non-technical summary of the sound environment mapping of the ASF network on the Charente Maritime department (17) in 2016") For type C maps (CBSTYPE), each noise zone shall be bounded by the lower limit isophone curve (Lden > 68 or 73, Ln > 62 or 65). For roads, the limit values correspond to a Lden of 68 dB(A) and a Ln of 62 dB(A). The noise level on a noise map is represented on the basis of regulatory indicators: the “Ln” (Level night) and the “Lden” (Level day-evening-night) (an indicator used for this geographical layer) which are harmonised indicators at European level. The Ln is the average sound level for the night period (22h-6h). The Lden is the 24-hour weighted average sound level to account for the perceived discomfort with the same noise level, which is higher in the evening and at night compared to the day