BS ISO 11222:2002

Foreword
Introduction
1 Scope
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
  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
    A.1 Input
    A.2 Uncertainty estimation of the
        monthly average
    A.3 Discussion
Bibliography

Defines a method for the quantification of the uncertainty of a time average of a set of air quality data obtained at a specified location over a defined averaging time period.

This International Standard provides a method for the quantification of the uncertainty of a time average of a set of air quality data obtained at a specified location over a defined averaging time period. The method is applicable to air quality data obtained by continuous or intermittent monitoring by means of a specified measuring system. The uncertainty of the time average depends on both the uncertainty of the measurement results and the uncertainty due to incomplete time coverage of the data set. This International Standard is only applicable if: the set of air quality data used to calculate the time average is representative of the temporal structure of the measurand over the defined time period, appropriate information on the uncertainty of the measurement results is available, and the measurement results have all been obtained at the same location. This International Standard implements recommendations of the Guide to the expression of uncertainty in measurement (GUM).