ISO INTERNATIONAL STANDARD 1996-1 Third edition 2016-03-01 Acoustics Description, measurement and assessment of environmentalnoise: Part 1: Basic quantities and assessment procedures AcoustiqueDescription,mesurageetévaluationdubruitde I'environnement Partie 1:Grandeurs fondamentales et méthodes d'évaluation Reference number IS0 1996-1:2016(E) ISO @ ISO 2016 IS0 1996-1:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2016, Published in Switzerland All rights reserved. Unless otherwise specified, 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 Ch. de Blandonnet 8. CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org i @ IS0 2016 - All rights reserved IS0 1996-1:2016(E) Contents Page Foreword ..V Introduction. ..vi 1 Scope. 2 Normative references 3 Terms and definitions 3.1 Expression of levels .2 3.2 Time intervals. 3.3 Ratings. 4 3.4 Sound designations. 3.5 Impulsivesound sources .6 3.6 Day, evening, night sound levels .6 4 Symbols. .7 5 Descriptors forenvironmental noise(s) 5.1 Singleevents .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 Descriptorsforcommunitynoise 9 6.2 Frequency weightings .9 6.3 Adjusted ievels. .9 6.3.1 Adjusted sound exposure levels 6.3.2 Adjustedequivalentcontinuoussoundpressurelevel .10 6.4 Ratinglevels ..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 theiroperating conditions .12 7.2.4 .12 Locations. 7.2.5 Propagation conditions .13 7.2.6 Uncertainties ..13 8 Reporting assessments of environmental noise(s) and estimation of long-term ..13 communityannoyanceresponse 8.1 Estimationoflong-termannoyanceresponseofcommunities ..13 8.2 Test report .13 AnnexA(informative)Adjustmentsforsoundsourceratinglevels ..15 Annex B (informative) High-energy impulse sounds .20 AnnexC (informative)Soundswithstronglow-frequencycontent .22 AnnexD(informative)Relationshipstoestimatethepercentage ofapopulationhighly annoyed and the 95 %predictionintervalas afunction ofadjusted day-evening- night and day-night sound levels.. .24 Annex E (informative) Estimated prevalence of a population highly annoyed as afunction of adjusted day-evening-night or day-night sound levels using the community @ IS0 2016 - All rights reserved ili