Simple download service (Atom) of the dataset: Noise zones where the indicator Ln (night) exceeds the limit value of 62 dB(A) in Finistère

Noise zones where the indicator Ln (night) exceeds the limit value of 62 dB(A) for roads with annual traffic exceeding 3 million vehicles in Finistère. N_BRUIT_ZBR_INFRA_C_LN62_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 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) — (This layer) 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300万辆的道路周边，夜间噪声指标Ln（Ln）超出62分贝（A计权，dB(A)）限值的噪声区域。 N_BRUIT_ZBR_INFRA_C_LN62_S_029 本图层属于菲尼斯泰尔省道路网噪声制图12组图层之一，对应《环境法典》R.572-1条及后续条款规定的第三阶段时限要求。 —— 5组24小时暴露量图层，以昼夜等效声级Lden（Lden）为指标，按每5分贝（A计权）为间隔分级，覆盖55dB(A)至75dB(A)及以上区间 —— 5组夜间暴露量图层，以夜间噪声指标Ln（Ln）为指标，按每5分贝（A计权）为间隔分级，覆盖50dB(A)至70dB(A)及以上区间 —— 1组24小时噪声超标图层：Lden＞68分贝（A计权） —— 1组夜间22时至次日6时噪声超标图层：Ln＞62分贝（A计权）——（即本图层） 随本文件附带有2018年12月14日发布的第2018348-0002号省政令，该政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噪声制图方案（对应第三阶段时限要求）。 此类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的噪声防护意识。 同时为主管部门提供客观的诊断依据，以支撑后续针对噪声暴露超标区域的治理行动。 此类噪声制图采用欧盟层面统一制定的各类交通噪声评估指标。 —— Lden指标：代表全天24小时的平均声级 —— Ln指标：代表夜间22时至次日6时的平均噪声级 —— dB(A)：依据人耳生理特性进行加权的声强测量单位（分贝）。 根据欧洲议会与欧盟理事会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》，共规定了四类噪声制图方案： —— A类Lden制图（日间噪声暴露图）：基于Lden指标（覆盖日间、傍晚、夜间，即全天24小时），采用55dB(A)至75dB(A)及以上、每5分贝（A计权）为一档的等声级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（夜间时段为22时至次日6时），采用50dB(A)至70dB(A)及以上、每5分贝（A计权）为一档的等声级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）超出68分贝（A计权）限值的区域，覆盖住宅、教育及医疗建筑区域 —— C类Ln制图（夜间噪声超标图）：标注Ln指标（夜间）超出62分贝（A计权）限值的区域，覆盖住宅、教育及医疗建筑区域