ISO 1996-2:2017描述了如何确定作为评估环境噪声限值或空间研究中情景比较基础的声压级。可通过直接测量和通过计算外推测量结果来确定。本文件主要用于室外，但也为室内测量提供了一些指导。它是灵活的，在很大程度上，用户决定测量工作，并相应地决定测量不确定度，这在每种情况下都是确定和报告的。因此，没有对允许的最大不确定度设置限制。通常，测量结果与计算相结合，以校正与实际测量期间不同的参考操作或传播条件。 本文件适用于各种环境噪声源，如道路和轨道交通噪声、飞机噪声和工业噪声。

ISO 1996-2:2017 describes how sound pressure levels intended as a basis for assessing environmental noise limits or comparison of scenarios in spatial studies can be determined. Determination can be done by direct measurement and by extrapolation of measurement results by means of calculation. This document is primarily intended to be used outdoors but some guidance is given for indoor measurements as well. It is flexible and to a large extent, the user determines the measurement effort and, accordingly, the measurement uncertainty, which is determined and reported in each case. Thus, no limits for allowable maximum uncertainty are set up. Often, the measurement results are combined with calculations to correct for reference operating or propagation conditions different from those during the actual measurement. This document can be applied on all kinds of environmental noise sources, such as road and rail traffic noise, aircraft noise and industrial noise.