Dataset Direct Download Service (WFS): Noise exposure zones where the Lden indicator (day, evening, night) is between 70 dB(A) and 75 dB(A) in Finistère

Noise exposure areas where the Lden indicator (day, evening, night) is between 70 dB(A) and 75 dB(A) for roads with annual traffic exceeding 3 million vehicles in Finistère. N_BRUIT_ZBR_INFRA_A_LD70_S_029 This layer is part of a set of 12 layers concerning noise mapping of the Finistère road network, third deadline, pursuant to Articles R 572-1 et seq. of the Environmental Code. — 5 layers of 24-hour exposure ranging from 55 dB(A) to 75 dB(A) and above, in steps of 5 in 5 dB(A) in Lden (This layer: zones 70-75) — 5 layers of night exposure ranging from 50 dB(A) to 70 dB(A) and above, in steps of 5 in 5 dB(A) in Ln — 1 layer of exceedance over 24 hours: Lden > 68 dB(A) — 1 layer of overtaking at night 22h to 06:00: LN > 62 dB(A) Attached hereto you will find Prefectural Decree No 2018348-0002 of 14 December 2018 establishing noise maps for road infrastructure with annual traffic exceeding 3 million vehicles, in the department of Finistère (3 rd deadline) The purpose of these maps is to inform and sensitise the public about their exposure to noise pollution. They shall provide the competent authorities with objective diagnostic elements to underpin future actions, in particular in the areas of excessive noise exposure. These noise maps are drawn up with harmonised indicators for all modes of transport at European level. — The Lden indicator: representative of the average sound level over all 24 hours of the day — Indicator Ln: representative of the average noise level for the night period from 22h to 6h — DB(A) is a unit of measurement expressing a level of intensity (decibel) weighted according to the physiological characteristics of the human ear. There are 4 types of noise maps provided for in European Directive 2002/49/EC of the European Parliament and of the Council of 25 June 2002 on the assessment and management of environmental noise Type A — Lden maps (day noise exposure cards) according to the Lden indicator (day, evening, night, (24 hours)). These maps show noise-exposed areas using isophone curves ranging from 55 dB(A) to 75 dB(A) and above, in steps of 5 in 5 dB(A) Type A — Ln cards (night noise exposure cards) according to the Ln indicator (night indicator from 22h to 6h). These maps show noise-exposed areas using isophone curves ranging from 50 dB(A) to 70 dB(A) and above, in steps of 5 in 5 dB(A) Type C cards — Lden: (cards of exceedance of limit values over 24h) Maps of areas where the Lden indicator (day, evening, night) exceeds the limit value of 68 dB(A) (concerns residential, educational and health buildings) Type C cards — Ln: (overtaking cards of limit values at night) Zone maps or indicator Ln (night) exceeds the limit value of 62 dB(A) (concerns residential, educational and health buildings)本图层对应法国菲尼斯泰尔省年度车流量超300万辆的道路周边，Lden指标（涵盖日间、傍晚、夜间全时段）处于70 dB(A)至75 dB(A)区间的噪声暴露区域。 N_BRUIT_ZBR_INFRA_A_LD70_S_029 本图层是菲尼斯泰尔省道路网噪声制图项目12个子图层之一，属于根据《环境法典》R.572-1条及后续条款要求的第三批次成果。 —— 5个Lden指标（24小时整体等效声级）子图层，覆盖55 dB(A)至75 dB(A)及以上区间，以5 dB(A)为步长划分；本图层对应70-75 dB(A)的噪声暴露区域 —— 5个Ln指标（夜间等效声级）子图层，覆盖50 dB(A)至70 dB(A)及以上区间，以5 dB(A)为步长划分 —— 1个24小时噪声超标子图层：Lden指标＞68 dB(A) —— 1个夜间22时至次日6时的噪声超标子图层：Ln指标＞62 dB(A) 随本文件附有的是2018年12月14日发布的第2018348-0002号省令，该法令针对菲尼斯泰尔省年度车流量超300万辆的道路基础设施制定了噪声制图方案（第三批次）。 此类噪声制图的目的在于向公众普及噪声污染相关知识，提升公众的噪声污染防范意识。同时可为主管部门提供客观的诊断依据，以支撑针对噪声超标暴露区域的后续治理工作。 本系列噪声制图采用欧盟层面统一的交通噪声评估指标编制。 —— Lden指标：代表全日24小时的平均等效声级 —— Ln指标：代表夜间22时至次日6时时段的平均等效声级 dB(A)是根据人耳生理特性加权的声强（分贝）计量单位。 欧盟2002年6月25日发布的《欧洲议会与理事会关于环境噪声评估与管理的指令（2002/49/EC）》规定了四类噪声制图标准： —— A类Lden制图（日间噪声暴露图）：基于Lden指标（涵盖日间、傍晚、夜间的24小时整体噪声），采用55 dB(A)至75 dB(A)及以上、以5 dB(A)为步长的等响曲线标注噪声暴露区域 —— A类Ln制图（夜间噪声暴露图）：基于Ln指标（夜间22时至次日6时时段噪声），采用50 dB(A)至70 dB(A)及以上、以5 dB(A)为步长的等响曲线标注噪声暴露区域 —— C类Lden制图（24小时噪声超标图）：标注Lden指标（日间、傍晚、夜间）超过68 dB(A)限值的区域，适用对象包括住宅、教育与医疗建筑 —— C类Ln制图（夜间噪声超标图）：标注Ln指标（夜间时段）超过62 dB(A)限值的区域，适用对象包括住宅、教育与医疗建筑