2021 strategic noise map rail traffic within major agglomerations – Lden contours

Strategic rail noise map (train and tram) for major agglomerations with more than 100 000 inhabitants according to RL 2002/49/EC. The reference year of these dates is 2021. The agglomerations to which these data relate are Antwerp, Bruges, Ghent and Leuven. The sound card indicates how much noise the environment is exposed to. The noise level is expressed in the parameter Lden. The Lden level is a weighted annual average sound pressure level over the course of the day at which evening and night levels are relatively heavier, which corresponds to the finding that noise pollution is generally perceived as more annoying in the evening and at night. European research therefore shows that a Lden is a relatively good predictor of the extent to which local residents may experience nuisance. These noise maps are updated every 5 years. As of the strategic noise maps with reference year 2021, a new calculation method was used. This is a new common European calculation method that is mandatory for all Member States as of the mapping exercise with reference year 2021. Because this calculation method differs from that used in previous mapping rounds, it is not appropriate to compare the results of reference year 2021 with previous editions (2006, 2011 and 2016). It cannot be ruled out that differences in calculated exposure are solely due to the application of this new calculation method and do not result from increased or reduced exposure.

符合欧盟指令2002/49/EC（RL 2002/49/EC）的铁路（含列车与有轨电车）战略噪声地图，覆盖人口超10万的大型城市聚居区。本数据集的基准年为2021年，涉及的聚居区包括安特卫普、布鲁日、根特与鲁汶。
本噪声地图的噪声分级指标可表征环境的噪声暴露程度，噪声水平以昼夜等效声级（Lden）量化。Lden为经加权处理的年度日均声压级，其中晚间与夜间的噪声权重更高，这契合了“夜间与晚间噪声污染更易引发居民反感”的普遍认知。欧洲相关研究表明，Lden参数可较好地预测当地居民可能遭遇的噪声侵扰程度。
该类战略噪声地图每5年更新一次。自基准年为2021年的战略噪声地图起，本次数据集采用了欧盟统一的全新计算规范；该规范自基准年2021年的噪声地图绘制工作起，成为所有欧盟成员国的强制实施标准。由于本次计算方法与此前各轮噪声地图绘制所使用的方法存在差异，因此不得将基准年2021年的结果与此前的版本（2006年、2011年及2016年）进行直接对比。无法排除计算所得的噪声暴露量差异仅源于本次新计算方法的应用，而非实际噪声暴露水平的升降变化。