Industry (within agglomerations) Noise Contours Lnight Round 1

Data indicating the level of noise according to the strategic noise mapping of industrial sources within areas with a population of at least 250,000 people (agglomerations). Lnight indicates night time annual average noise level results in dB, where night is defined as 2300
- 0700. This data is a product of the strategic noise mapping analysis undertaken to meet the requirements of the Environmental Noise Directive (Directive 2002/49/EC).

本数据集呈现了针对人口不少于25万的集聚都市区内工业噪声源开展的战略噪声测绘所得的噪声水平。其中Lnight代表夜间年度平均噪声水平，单位为分贝（dB），夜间时段定义为23:00至07:00。本数据集为满足《环境噪声指令》（指令2002/49/EC）相关要求所开展的战略噪声测绘分析的产出成果。