Noise zone of the Paris line — Le Havre of a strategic noise map of type C index Ln (night)

European Directive 2002/49/EC of 25 June 2002 on the assessment and management of environmental noise entails for EU Member States an assessment of environmental noise in the vicinity of major transport infrastructure (land and air) and in large agglomerations.
This assessment is carried out in particular through the development of strategic ‘so-called’ noise maps.

These maps are intended to be reviewed and revised every 5 years. The first
series were developed in 2007 (1st deadline) and 2012 (2nd maturity).
2017 is therefore the year of the 3 rd deadline.

CBS are required, in particular, for rail infrastructure with more traffic than
30 000 train crossings per year.;
For major road and rail transport infrastructure, the CBS shall be established, adopted and approved under the authority of the Prefect of the Department: the Noise Card Approval Order is dated November 16, 2018

Noise maps are developed according to the indicators established by the European Directive, namely Lden (Day Evening Night Level) and Ln (Night Level).
• Day/day: [6h-18h]
• Evening/evening: [18h-22h]
• Night/night: [22h-6h]
The Lden and Ln indicators correspond to a defined energy average over the periods (Day/Black/Night) for Lden and (Night) for Ln. The corresponding results are expressed in A or dB(A) weighted decibels.

Noise-exposed areas (type C map) represent areas where limit values are exceeded:
Lden Index >73 dB(A)
Index Ln > 65 dB(A)

2002年6月25日欧盟发布的《2002/49/EC号指令》（关于环境噪音的评估与管理）要求欧盟成员国对主要交通基础设施（陆路及航空）周边以及大型聚居区开展环境噪音评估。
该评估主要通过制定战略性的"所谓"噪音地图来实施。此类地图需每5年进行一次复核与修订。首批地图分别于2007年（第一时限）与2012年（第二时限）完成编制，因此2017年为第三时限对应的年份。
对于年列车穿越量超过3万次的铁路基础设施，需编制CBS。针对主要公路及铁路交通基础设施，CBS需在部门省长的职权范围内完成编制、采纳与审批，相关《噪音卡片审批令》的签发日期为2018年11月16日。
噪音地图的编制需遵循欧盟指令规定的指标，即Lden（昼间-傍晚-夜间声级）与Ln（夜间声级）。具体时段划分如下：
• 昼间：6时至18时
• 傍晚：18时至22时
• 夜间：22时至次日6时
Lden与Ln指标分别对应昼间、傍晚、夜间时段（Lden指标）以及夜间时段（Ln指标）的规定能量平均值，计算结果以A计权分贝（dB(A)）表示。
噪音暴露区域（C类地图）指超出限值标准的区域，具体限值要求为：
Lden指数＞73 dB(A)
Ln指数＞65 dB(A)