Dataset Direct Download Service (WFS): Noise exposure zones where the indicator Ln (night) is 70 dB(A) and + in Finistère

Noise exposure areas where the Ln indicator (night) is 70 dB(A) and + for roads with annual traffic exceeding 3 million vehicles in Finistère. N_BRUIT_ZBR_INFRA_A_LN70_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 — 5 layers of exposure at night ranging from 50 dB(A) to 70 dB(A) and above, in steps of 5 in 5 dB(A) in Ln (This layer: zones 70 and +) — 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)菲尼斯泰尔省（Finistère）年度车流量超过300万辆的道路沿线，夜间等效声级（Ln）≥70分贝（A计权，dB(A)）的噪声暴露区域。 N_BRUIT_ZBR_INFRA_A_LN70_S_029 本图层属于菲尼斯泰尔省道路网噪声制图项目的12个图层集之一，对应《法国环境法典》R.572-1条及后续条款规定的第三阶段任务。 —— 5个24小时噪声暴露图层，以昼夜等效声级（Lden）为评价指标，噪声水平覆盖55~75分贝（A计权）及以上，按每5分贝（A计权）分级 —— 5个夜间噪声暴露图层，以夜间等效声级（Ln）为评价指标，噪声水平覆盖50~70分贝（A计权）及以上，按每5分贝（A计权）分级（本图层对应70分贝及以上区域） —— 1个24小时噪声超标图层：昼夜等效声级（Lden）＞68分贝（A计权） —— 1个夜间（22时至次日6时）噪声超标图层：夜间等效声级（Ln）＞62分贝（A计权） 随本文件附有菲尼斯泰尔省省长令第2018348-0002号，该令于2018年12月14日发布，旨在为菲尼斯泰尔省年度车流量超300万辆的道路基础设施制定噪声制图（对应第三阶段任务） 本套噪声制图的目的在于向公众告知噪声污染暴露情况，并提升公众对噪声污染的认知与防范意识。 它们将为主管部门提供客观的诊断依据，以支撑未来针对噪声过度暴露区域的治理行动。 本套噪声制图采用欧盟层面统一的各类交通噪声评价指标制定。 —— 昼夜等效声级（Lden）：代表全天24小时的平均等效声级 —— 夜间等效声级（Ln）：代表22时至次日6时夜间时段的平均等效声级 —— dB(A)是根据人耳生理特性进行计权的声强级测量单位，即A计权分贝（dB(A)）。 欧盟议会与理事会2002年6月25日发布的《关于环境噪声评估与管理的2002/49/EC号指令》规定了四类噪声制图标准： —— A类Lden制图（日间噪声暴露图）：以昼夜等效声级（Lden）为评价指标（覆盖日间、傍晚、夜间，即全天24小时），采用55~75分贝（A计权）及以上、每5分贝（A计权）一级的等声级曲线标示噪声暴露区域 —— A类Ln制图（夜间噪声暴露图）：以夜间等效声级（Ln）为评价指标（覆盖22时至次日6时夜间时段），采用50~70分贝（A计权）及以上、每5分贝（A计权）一级的等声级曲线标示噪声暴露区域 —— C类Lden制图（24小时噪声限值超标图）：标示昼夜等效声级（Lden）（日间、傍晚、夜间）超过68分贝（A计权）限值的区域，该类区域涉及住宅、教育及医疗建筑 —— C类Ln制图（夜间噪声限值超标图）：标示夜间等效声级（Ln）超过62分贝（A计权）限值的区域，该类区域涉及住宅、教育及医疗建筑