SIST ISO 1996-1:2016

INTERNATIONAL ISO
STANDARD 1996-1
Third edition
2016-03-01
Acoustics — Description,
measurement and assessment of
environmental noise —
Part 1:
Basic quantities and assessment
procedures
Acoustique — Description, mesurage et évaluation du bruit de
l’environnement —
Partie 1: Grandeurs fondamentales et méthodes d’évaluation
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
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ii © ISO 2016 – All rights reserved

Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Expression of levels . 2
3.2 Time intervals . 3
3.3 Ratings . 4
3.4 Sound designations . 4
3.5 Impulsive sound sources . 6
3.6 Day, evening, night sound levels . 6
4 Symbols . 7
5 Descriptors for environmental noise(s) . 8
5.1 Single events . 8
5.1.1 Descriptors . . . 8
5.1.2 Event duration . 8
5.2 Repetitive single events . 8
5.3 Continuous sound . 9
6 Noise annoyance . 9
6.1 Descriptors for community noise . 9
6.2 Frequency weightings . 9
6.3 Adjusted levels . 9
6.3.1 Adjusted sound exposure levels . 9
6.3.2 Adjusted equivalent continuous sound pressure level .10
6.4 Rating levels .10
6.4.1 One sound source .10
6.4.2 Combined sources .10
6.5 Composite whole-day rating levels .11
7 Noise limit requirements .11
7.1 General .11
7.2 Specifications.12
7.2.1 Noise descriptors.12
7.2.2 Relevant time intervals .12
7.2.3 Sound sources and their operating conditions .12
7.2.4 Locations . .12
7.2.5 Propagation conditions .13
7.2.6 Uncertainties .13
8 Reporting assessments of environmental noise(s) and estimation of long-term
community annoyance response .13
8.1 Estimation of long-term annoyance response of communities .13
8.2 Test report .13
Annex A (informative) Adjustments for sound source rating levels .15
Annex B (informative) High-energy impulse sounds .20
Annex C (informative) Sounds with strong low-frequency content .22
Annex D (informative) Relationships to estimate the percentage of a population highly
annoyed and the 95 % prediction interval as a function of adjusted day-evening-
night and day-night sound levels .24
Annex E (informative) Estimated prevalence of a population highly annoyed as a function
of adjusted day-evening-night or day-night sound levels using the community
tolerance level formulation .26
Annex F (informative) Estimated prevalence of a population highly annoyed as a function of
adjusted day-evening-night or day-night sound level using a regression formulation .33
Annex G (informative) Annoyance caused by exposure to sound in multi-source environments .39
Annex H (informative) Theory-based approach to predict the growth of annoyance.41
Bibliography .45
iv © ISO 2016 – All rights reserved

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.
This third edition cancels and replaces the second edition (ISO 1996-1:2003), which has been technically
revised. In particular, the following subclauses and annexes have been added or revised: 3.6, 6.3.1, 6.5,
8.1, 8.2.1 i), Annex A, Annex D, Annex E, Annex F, Annex G, and Annex H.
ISO 1996 consists of the following parts, under the general title Acoustics — Description, measurement
and assessment of environmental noise:
— Part 1: Basic quantities and assessment procedures
— Part 2: Determination of sound pressure levels
Introduction
To be of practical use, any method of description, measurement, and assessment of environmental noise
is intended to be related in some way to what is known about human response to noise. Many adverse
consequences of environmental noise increase with increasing noise, but the precise dose-response
relationships involved continue to be the subject of scientific debate. In addition, it is important that
all methods used be practicable within the social, economic, and political climate in which they are
used. For these reasons, there is a very large range of different methods in use around the world for
different types of noise, and this creates considerable difficulties for international comparison and
understanding.
The broad aim of the ISO 1996 series is to contribute to the international harmonization of methods of
description, measurement, and assessment of environmental noise from all sources.
The methods and procedures described in this part of ISO 1996 are intended to be applicable to noise
from various sources, individually or in combination, which contribute to the total exposure at a site.
At the stage of technology at the time of publication of this part of ISO 1996, the evaluation of long-
term noise annoyance seems to be best met by adopting the adjusted A-weighted equivalent continuous
sound p
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