ISO INTERNATIONAL STANDARD 11222 First edition 2002-07-01 Air quality Determination of the uncertainty of the time average of air quality measurements Qualite de I'air- Détermination de I'incertitude de mesure de la moyenne temporelle de mesurages de la qualité de I'air Reference number ISO 11222:2002(E) ISO @ ISO 2002 No r py IHS under lic Not for Resale ISO 11222:2002(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by isO member bodies. In the unlikely event @ ISO2002 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 either IsO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56. CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.ch Web www.iso.ch Printed in Switzerland @ISO2002-All rights reserved py IHS unde ermittedwithout license from IHS Not for Resale ISO 11222:2002(E) Contents Page Foreword Introduction Scope 7 2 Normative reference... 3 Terms and definitions 4 Symbols and abbreviated terms .. 5 Requirements on the input data.. 5.1 General... 5.2 Specific requirements on input data . 6 Procedure 6.1 General..... 6.2 Standard uncertainty induced by the measuring system .. 6.3 Standard uncertainty due to incomplete time coverage . 0 6.4 Combined standard uncertainty .... 6.5 Expanded uncertainty 7 Reporting uncertainty . Annex A (informative) Example - . Quantification of the uncertainty of a monthly average of nitrogen dioxide in ambient air.... 1:3 A.1 Input ... 13 A.2 Uncertainty estimation of the monthly average 17 A.3 Discussion. 19 Bibliography 20 ii by IHS under se from IHS Not for Resale