Appendix B (Normative Appendix) Monitoring Method of Acoustic Environment Functional Zone B. 1 Monitoring Purpose To evaluate the daytime and nighttime acoustic environment quality of different acoustic environment functional zones, and understand the spatial and temporal distribution characteristics of environmental noise in functional zones. B.2 Fixed-point Monitoring Method B.2. 1 Monitoring requires that several monitoring points that can reflect the acoustic environment quality characteristics of each functional area are selected from 1 for long-term fixed-point monitoring, and the position and height of each measurement should remain unchanged. For class 0, 1, 2, and 3 acoustic environment functional areas, the monitoring points should be outdoor long-term stable places, with the height above the ground as the possible maximum of the vertical distribution of the sound field, and their positions should be able to avoid reflecting surfaces and nearby fixed noise sources; The monitoring point of the fourth acoustic environment functional area is located at the possible maximum of the vertical distribution of outdoor traffic noise in noise-sensitive structures in the first row of the fourth area. The monitoring of acoustic environment functional areas should be carried out continuously for at least one day and night for 24 hours at a time, and the equivalent sound levels Leq, ld, Ln and the maximum sound level Lmax of each hour and day and night can be obtained. For noise analysis, monitoring items can be appropriately increased, such as cumulative percentage sound level L 10, L50, L90, etc. Monitoring should avoid holidays and abnormal working days. Attachment C (normative appendix) Monitoring method for noise-sensitive structures C.3 Monitoring results evaluate whether the Leq and Lmax of environmental noise sources in normal working hours during the day and night are used as the basis for evaluating the outdoor (or indoor) environmental noise level of noise-sensitive structures, and whether they meet the environmental quality requirements of acoustic environment functional areas. View original post >>

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