Standard
Track updates
AS/NZS ISO 20988:2024
[Current]Air quality - Guidelines for estimating measurement uncertainty
AS/NZS ISO 20988:2024 identically adopts ISO 20988:2007 which provides comprehensive guidance and specific statistical procedures for uncertainty estimation in air quality measurements
Published: 04/10/2024
Pages: 81
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Basic concepts
5.1 Outline
5.2 Measurement uncertainty
5.3 Correction for systematic effects
5.4 Provision of input data
6 Problem specification
6.1 Objectives
6.2 Measurement
6.3 Uncertainty parameters
6.4 Input data
6.4.1 General
6.4.2 Assessment of representativeness
6.5 Effects not described by series of observations
7 Statistical analysis
7.1 Objectives
7.2 Indirect approach
7.3 Direct approach
7.4 Statistical validity
8 Estimation of variances and covariances
8.1 General
8.2 Variance estimates of Type A
8.3 Variance estimates of Type B
8.4 Estimation of covariances
9 Evaluation of uncertainty parameters
9.1 Objective
9.2 Combined standard uncertainty
9.3 Expanded uncertainty
9.3.1 General
9.3.2 Expanded uncertainty of results exhibiting a Gaussian distribution
10 Reporting
Annex A
A.1 General
A.2 Robust estimation of coverage probability
A.3 Testing a coverage probability
Annex B
B.1 General
B.2 Simple random sampling
B.3 Repeated observation of a reference material by a measuring system
B.4 Observation of different reference materials in a calibration procedure
B.5 Observation of different reference materials by identical measuring systems
B.6 Parallel measurements with a reference method of measurement in a calibration procedure
B.7 Parallel measurements with a reference method of measurement in an evaluation procedure
B.8 Paired measurements of two identical measuring systems
B.9 Interlaboratory comparison of identical measuring systems
B.10 Parallel application of identical measuring systems under field conditions
Annex C
C.1 Introduction
C.2 Simple random sampling
C.3 Control of ozone measuring system by means of check-standards
C.4 Calibration of gas-chromatograph using standard solutions of benzene
C.5 Evaluation of toluene measuring method for use in industrial hygiene
C.6 Calibration of an automated emission measuring system
C.7 Passive sampling of nitrogen dioxide compared with a reference method
C.8 Paired measurements of mercury in stationary source emissions by a manual method of measurement
C.9 Interlaboratory comparison of a measuring method of carbon monoxide in ambient air
C.10 Field-validation of a measuring method of lead in ambient air
Bibliography
Cited references in this standard
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