本标准规定了表征受保护环境中残余声级的测量程序 自然区域和安静的住宅区。本标准规定了仪器、测量 持续时间，以及总结数据的统计程序。提供了一种过滤程序: 可适用于A加权数据，以在适当情况下排除高频声能，或 保证的规定了计算L90等超标值的统计程序。

This standard specifies measurement procedures for characterizing residual sound levels in protected natural areas and quiet residential areas. The standard specifies instrumentation, measurement durations, and statistical procedures for summarizing the data. A filtering procedure is provided that can be applied to A-weighted data to exclude high frequency sound energy where appropriate or warranted. The statistical procedure for calculating exceedance values like L90 is specified.