SIST EN ISO 9612:2025

Acoustics - Determination of occupational noise exposure - Methodology (ISO 9612:2025)

This document specifies a method for measuring workers’ exposure to noise in a working environment and calculating the noise exposure level. This document deals with A-weighted levels but is applicable also to C-weighted levels. Three different strategies for measurement are specified. The method is applicable for detailed noise exposure studies or epidemiological studies of hearing damage or other adverse effects.
The measuring process requires observation and analysis of the noise exposure conditions so that the quality of the measurements can be controlled. This document provides methods for estimating the uncertainty of the results.
This document is not intended for assessment of masking of oral communication or assessment of infrasound, ultrasound and non-auditory effects of noise. It does not apply to the measurement of the noise exposure of the ear when hearing protectors are worn.
Results of the measurements performed in accordance with this document can provide useful information when defining priorities for noise control measures.

Akustik - Bestimmung der Lärmexposition am Arbeitsplatz - Verfahren der Genauigkeitsklasse 2 (Ingenieurverfahren) (ISO 9612:2025)

Dieses Dokument legt ein Verfahren fest, um die Lärmbelastung von Beschäftigten am Arbeitsplatz zu erfassen und den Lärmexpositionspegel zu berechnen. Dieses Dokument behandelt die Messung von A-bewerteten Pegeln, ist aber ebenso auf C-bewertete Pegel anwendbar. Es werden drei verschiedene Messstrategien festgelegt. Das Verfahren ist für ausführliche Studien zur Lärmexposition oder für epidemiologische Studien im Hinblick auf Gehörschäden oder andere nachteilige Auswirkungen anwendbar.
Die Durchführung der Messung erfordert die Beobachtung und Analyse der Lärmbelastungsbedingungen, so dass die Qualität der Messungen überprüft werden kann. Dieses Dokument beschreibt Verfahren zur Abschätzung der Unsicherheit der Ergebnisse.
Dieses Dokument ist nicht für die Untersuchung der Verdeckung von Sprache oder die Untersuchung von Infraschall, Ultraschall und extra-auralen Lärmwirkungen vorgesehen. Es ist nicht anwendbar, um die Lärmbelastung des durch Gehörschutz geschützten Ohres zu messen.
Die Ergebnisse der Messungen, die in Übereinstimmung mit diesem Dokument durchgeführt wurden, können nützliche Informationen für die Festlegung von Prioritäten bei Lärmminderungsmaßnahmen liefern.

Acoustique - Détermination de l'exposition au bruit en milieu de travail - Méthodologie (ISO 9612:2025)

Le présent document spécifie une méthode permettant de mesurer l’exposition au bruit des travailleurs dans un environnement de travail et de calculer le niveau d’exposition au bruit. Il traite des niveaux pondérés A, mais est également applicable aux niveaux pondérés C. Trois stratégies de mesure différentes sont spécifiées. La méthode s’applique pour des études détaillées d’exposition au bruit ou pour des études épidémiologiques relatives à une détérioration de l’audition ou d’autres effets nocifs.
Le processus de mesure requiert une observation et une analyse des conditions d’exposition au bruit permettant le contrôle de la qualité des mesurages. Le présent document fournit des méthodes permettant d’estimer l’incertitude des résultats.
Le présent document n’est pas destiné à l’évaluation du masquage de la communication parlée ni à l’évaluation des effets des infrasons, des ultrasons et des effets non auditifs du bruit. Il ne s’applique pas au mesurage de l’exposition au bruit de l’oreille quand des protecteurs individuels contre le bruit sont portés.
Les résultats des mesurages effectués conformément au présent document peuvent fournir des informations utiles lors de la définition des priorités en matière de moyens de contrôle du bruit.

Akustika - Določanje izpostavljenosti hrupu v delovnem okolju - Metodologija (ISO 9612:2025)

General Information

• Status: Published
• Public Enquiry End Date: 09-Apr-2023
• Publication Date: 24-Sep-2025
• ICS: 13.140 - Noise with respect to human beings
• Technical Committee: AKU - Acoustics
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 18-Jun-2025
• Due Date: 23-Aug-2025
• Completion Date: 25-Sep-2025
• Ref Project: EN ISO 9612:2025 - Acoustics - Determination of occupational noise exposure - Methodology (ISO 9612:2025)

Relations

• Replaces: SIST EN ISO 9612:2009 - Acoustics - Determination of occupational noise exposure - Engineering method (ISO 9612:2009)
• Effective Date: 01-Nov-2025

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2025
Nadomešča:
SIST EN ISO 9612:2009
Akustika - Določanje izpostavljenosti hrupu v delovnem okolju - Metodologija (ISO
9612:2025)
Acoustics - Determination of occupational noise exposure - Methodology (ISO
9612:2025)
Akustik - Bestimmung der Lärmexposition am Arbeitsplatz - Verfahren der
Genauigkeitsklasse 2 (Ingenieurverfahren) (ISO 9612:2025)
Acoustique - Détermination de l'exposition au bruit en milieu de travail - Méthodologie
(ISO 9612:2025)
Ta slovenski standard je istoveten z: EN ISO 9612:2025
ICS:
13.140 Vpliv hrupa na ljudi Noise with respect to human
beings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 9612
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2025
EUROPÄISCHE NORM
ICS 13.140 Supersedes EN ISO 9612:2009
English Version
Acoustics - Determination of occupational noise exposure -
Methodology (ISO 9612:2025)
Acoustique - Détermination de l'exposition au bruit en Akustik - Bestimmung der Lärmexposition am
milieu de travail - Méthodologie (ISO 9612:2025) Arbeitsplatz - Methodik (ISO 9612:2025)
This European Standard was approved by CEN on 5 March 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9612:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 9612:2025) has been prepared by Technical Committee ISO/TC 43 "Acoustics"
in collaboration with Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by
DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by December 2025, and conflicting national standards
shall be withdrawn at the latest by December 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 9612:2009.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 9612:2025 has been approved by CEN as EN ISO 9612:2025 without any modification.

International
Standard
ISO 9612
Third edition
Acoustics — Determination of
2025-05
occupational noise exposure —
Methodology
Acoustique — Détermination de l’exposition au bruit en milieu de
travail — Méthodologie
Reference number
ISO 9612:2025(en) © ISO 2025
ISO 9612:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
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Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 9612:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 Instrumentation . 5
5.1 Sound level meters and personal sound exposure meters .5
5.2 Calibrator . .5
5.3 Periodic verification .6
6 Methodology – Chronological steps . 6
6.1 Step 1: Work analysis .6
6.2 Step 2: Selection of the measurement strategy .6
6.3 Step 3: Measurements .6
6.4 Step 4: Error handling and uncertainties .6
6.5 Step 5: Calculation and presentation of results and uncertainty .6
7 Work analysis . 6
7.1 General .6
7.2 Defining homogeneous noise exposure groups (HEG) .7
7.3 Determination of a nominal day .7
8 Selection of measurement strategies. 8
8.1 General .8
8.2 Measurement strategies .8
9 Strategy 1 – Task-based measurement . 8
9.1 Dividing the nominal day into tasks .8
9.2 Duration of tasks .8
9.3 Measurement of L for tasks .
pT,,Aeq
m
9.3.1 General .9
9.3.2 Number of measurements . .9
9.3.3 Time and duration of measurements .10
9.3.4 Calculation of the A-weighted equivalent continuous sound pressure level .10
9.4 Calculation of contribution from each task to daily noise exposure level .10
9.5 Determination of daily noise exposure level .11
10 Strategy 2 – Job-based measurement .12
10.1 General . 12
10.2 Measurement plan – Number, duration and distribution of measurements . 12
10.3 Measurements . 12
10.4 Determination of daily noise exposure levels for workers in a homogeneous noise
exposure group . 13
11 Strategy 3 — Full-day measurement .13
11.1 General . 13
11.2 Observing work activities and monitoring measurements .14
11.3 Measurements .14
11.4 Determination of daily noise exposure level . 15
12 Measurements .15
12.1 Selection of instrumentation .
...