1、 Reference number ISO 4226:2007(E) ISO 2007INTERNATIONAL STANDARD ISO 4226 Third edition 2007-12-15 Air quality General aspects Units of measurement Qualit de lair Aspects gnraux Units de mesurage ISO 4226:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes
2、 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 file, parties accept therein the responsibility of not infringing Adobes licensing policy. T
3、he ISO Central Secretariat accepts no liability in 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 h
4、as been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2007 All rights reserved. Unless otherwise specified, no pa
5、rt 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 ISOs member body in the country of the requester. ISO copyright office Case postale
6、56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2007 All rights reservedISO 4226:2007(E) ISO 2007 All rights reserved iiiForeword ISO (the International Organization for Standardization) is a worldwide federati
7、on 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
8、. 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. International Standards are drafted in accordance w
9、ith the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires appr
10、oval by at least 75 % of the member bodies casting a vote. ISO 4226 was prepared by Technical Committee ISO/TC 146, Air quality, Subcommittee SC 4, General aspects. This third edition cancels and replaces the second edition (ISO 4226:1993), Table 1 of which has been editorially revised. ISO 4226:200
11、7(E) iv ISO 2007 All rights reservedIntroduction The series of International Standards on air quality includes the standardization of methods for the measurement of gases, vapours and particles. In order to enable results to be compared either within or between countries, it is essential to use agre
12、ed units of measurement to report the results and other relevant information so that sound conclusions may be drawn. It is also desirable to keep the number of units of measurement to a minimum. INTERNATIONAL STANDARD ISO 4226:2007(E) ISO 2007 All rights reserved 1Air quality General aspects Units o
13、f measurement 1 Scope This International Standard lays down the units to be used when reporting results of air quality measurements. NOTE General guidance on the International System of Units is given in ISO 1000. 2 Normative references The following referenced documents are indispensable for the ap
14、plication of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 31-0, Quantities and units Part 0: General principles ISO 1000, SI units and recommendations for the use of
15、their multiples and of certain other units 3 Units The units specified in Table 1 shall be used when reporting results of air quality measurements. The units of other quantities used in reporting shall be in accordance with ISO 1000 and with the general principles concerning units specified in ISO 3
16、1-0. ISO 4226:2007(E) 2 ISO 2007 All rights reservedTable 1 Units Unit No. Quantity Name Symbol 3.1 Units for substances 3.1.1 Gases and vapours 3.1.1.1 volume or mass fraction of main constituents (for example nitrogen, oxygen, carbon dioxide in air) percent % 3.1.1.2 volume fraction of gaseous pol
17、lutants acubic centimetre per cubic metre cubic millimetre per cubic metre cm 3 /m 3mm 3 /m 33.1.1.3 molar fraction of gaseous pollutants amillimole per mole micromole per mole nanomole per mole mmol/mol mol/mol nmol/mol 3.1.1.4 mass concentration of gaseous pollutants bmilligram per cubic metre mic
18、rogram per cubic metre nanogram per cubic metre picogram per cubic metre mg/m 3g/m 3ng/m 3pg/m 33.1.1.5 diffusion coefficient of gaseous pollutants centimetre squared per second centimetre squared per minute cm 2 /s cm 2 /min 3.1.2 Particles 3.1.2.1 mass concentration of suspended matter bmilligram
19、per cubic metre microgram per cubic metre nanogram per cubic metre picogram per cubic metre mg/m 3g/m 3ng/m 3pg/m 33.1.2.2 size of particles micrometre nanometre m nm 3.1.2.3 atmospheric dustfall c(deposit gauges) gram per square metre day milligram per square metre day g/(m 2 d) mg/(m 2 d) 3.1.2.4
20、deposition rate microgram per square metre second g/(m 2 s) 3.1.2.5 deposition velocity centimetre per second cm/s 3.1.2.6 number concentration (for example of biological, microbiological and other suspended matter, i.e. pollen, spores, micro-organisms, particles) breciprocal cubic metre reciprocal
21、cubic decimetre m 3dm 33.2 Units for specifying the state of gas 3.2.1 thermodynamic temperature kelvin K 3.2.2 Celsius temperature degree Celsius C 3.2.3 pressure pascal kilopascal Pa kPa 3.2.4 relative humidity (ratio of vapour pressure to saturation vapour pressure with respect to water) percent
22、% 3.3 Meteorological quantities 3.3.1 wind speed metre per second m/s 3.3.2 wind direction ddegree 3.3.3 precipitation intensity millimetre per day millimetre per hour mm/d mm/h ISO 4226:2007(E) ISO 2007 All rights reserved 3Table 1 (continued) Unit No. Quantity Name Symbol 3.3.4 irradiance watt per
23、 square metre W/m 23.3.5 atmospheric pressure hectopascal kilopascal hPa kPa 3.3.6 absolute humidity (mass of water vapour to total volume) gram per cubic metre g/m 33.3.7 mixing ratio (mass of water vapour to mass of dry air) gram per kilogram g/kg 3.3.8 visibility (visual range) kilometre km 3.4 T
24、ime second minute hour day s min h d 3.5 Miscellaneous 3.5.1 geographical coordinates northern (N) or southern (S) latitude eastern (E) or western (W) longitude edegree minute second “ 3.5.2 universal transverse Mercator (UTM) coordinates fmetre m 3.5.3 altitude metre m aAbbreviated terms such as “p
25、pm” (parts per million) and “ppb” parts per (US) billion equivalent to parts per thousand million shall not be used. A volume fraction of e.g. 4,3 cm 3 /m 3is equal to 4,3 10 6 . A volume fraction of e.g. 4,3 mm 3 /m 3is equal to 4,3 10 9 . A molar fraction of e.g. 3,0 nmol/mol is equal to 3,0 10 9
26、. bIf concentrations are expressed in terms of mass per volume, temperature and pressure as well as humidity have to be specified (e.g. ambient conditions or specific standard conditions). cWhen deposit gauges are used, no account is taken of the volume of air from which the atmospheric dustfall is
27、deposited; the duration of collection of the atmospheric dustfall should also be reported. dWind direction is conventionally reported as an angle, in degrees, measured clockwise over 360 for the full circle starting from the true north as 0. eNorthern latitude can also be indicated by “+”, southern
28、latitude by “” in front of the numbers of the degrees. Longitude can also be indicated with respect to the longitude of Greenwich by, using “+” for western longitude and “” for eastern longitude. fUTM coordinates are expressed in terms of a zone and easting and northing coordinates within this zone. The coordinates are expressed in metres. ISO 4226:2007(E) ICS 01.060; 13.040.01 Price based on 3 pages ISO 2007 All rights reserved
