Map Viewing Service (WMS) 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）年度车流量超过300万辆的道路周边，夜间噪声指标Ln（nighttime noise indicator）超过62分贝(A)限值的噪声超标区域。 图层编号：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系列的12个图层之一，为第三阶段成果，依据法国《环境法典》第R.572-1条及后续相关条款制定。 —— 5个24小时噪声暴露图层，以昼夜等效声级Lden（Lden）为指标，按每5分贝(A)为一档，覆盖55分贝(A)至75分贝(A)及以上区间 —— 5个夜间噪声暴露图层，以夜间噪声指标Ln为指标，按每5分贝(A)为一档，覆盖50分贝(A)至70分贝(A)及以上区间 —— 1个24小时噪声超标图层：Lden＞68分贝(A) —— 1个夜间22时至次日6时的噪声超标图层：夜间噪声指标Ln＞62分贝(A)——（即本图层） 随本文件附有请参阅2018年12月14日发布的第2018348-0002号省长令，该命令为菲尼斯泰尔省年度车流量超过300万辆的道路基础设施制定了噪声制图标准（第三阶段成果）。 此类噪声制图的目的在于向公众通报噪声污染暴露情况，提升公众的噪声防护意识。同时可为主管部门提供客观的诊断依据，以支撑后续噪声治理相关工作，尤其是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的各类交通噪声评价指标制定。 —— 昼夜等效声级Lden（Lden）：代表全天24小时的平均声级 —— 夜间噪声指标Ln：代表22时至次日6时夜间时段的平均噪声级 —— 分贝(A)[dB(A)]：根据人耳生理特性加权后的声强级测量单位。 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4类噪声制图成果： —— 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，即全天24小时）制作。此类制图采用等声级线划分噪声暴露区域，档位设置为每5分贝(A)一档，覆盖55分贝(A)至75分贝(A)及以上区间 —— A类Ln制图（夜间噪声暴露图）：基于夜间噪声指标Ln制作（覆盖时段为22时至次日6时）。此类制图采用等声级线划分噪声暴露区域，档位设置为每5分贝(A)一档，覆盖50分贝(A)至70分贝(A)及以上区间 —— C类Lden制图（24小时噪声限值超标图）：即Lden指标（涵盖日间、傍晚、夜间）超过68分贝(A)限值的区域制图，适用对象为住宅、教育及医疗建筑 —— C类Ln制图（夜间噪声限值超标图）：即夜间噪声指标Ln超过62分贝(A)限值的区域制图，适用对象为住宅、教育及医疗建筑