ISO INTERNATIONAL STANDARD 7708 First edition 1995-04-01 Air quality Particle size fraction definitions for health-related sampling Qualité de I'air -- Definitions des fractions de taille des particules pour I'échantillonnage lie aux problemes de sante TSO Reference number ISO 7708:1995(E) Copyright International Organization for Standardization vided by IHS d without license from IHS Not for Resale IS07708:1995(E) Contents Page 1 Scope 2 Definitions 3 Principle 2 4 Assumptions and approximations 2 Inhalable convention 3 6 Thoracic convention 3 Respirable conventions 3 8 Extrathoracic and tracheobronchial conventions 3 9 Performanceofinstruments 4 Annexes A Nomenclature of inhalable and respirable fractions 5 B Numerical approximations to cumulative log-normal distributions 6 c Bibliography 9 ISO1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organizationfor Standardization Case Postale 56 CH-1211 Geneve 20 : Switzerland Printed in Switzerland Copyright Intemational Organization for Standardization Not for Resale OSI 0 ISO7708:1995(E) 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 7708 was prepared by Technical Committee ISO/TC 146, Air quality. Thisfirst.. edition cancels and ,replacesthe Technical Report ISO/TR 7708:1983, of which it constitutes a technical revision. Annexes A, B and C of this International Standard are for information only. ili CopyightieationalOrganizatinrStandardizatio without license from IHS Not for Resale