EN 14907:2005

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
  3.1 Terms and definitions
  3.2 Abbreviations
4 Principle
  4.1 Description of the standard measuring principle
  4.2 Description of QA/QC procedures
5 Equipment and facilities
  5.1 Sampling system components
  5.2 Weighing facilities
6 Sampling and weighing procedure
  6.1 General
  6.2 Weighing room procedures
  6.3 Unloaded filter weighing
  6.4 Sampling period
  6.5 Sample storage and transport procedures
  6.6 Loaded filter weighing
7 Additional quality assurance and quality control
  7.1 General
  7.2 Maintenance of the sampling system
  7.3 Calibration
  7.4 Field blanks
8 Expression of results
9 Performance characteristics of the method
  9.1 General
  9.2 GUM concept
  9.3 Individual uncertainty sources
  9.4 Expanded uncertainty vs. EU Data Quality Objectives
Annex A (informative) Equivalence test procedure for
        non-standard measurement methods
      A.1 General
      A.2 Formal procedures
      A.3 Overview of test procedure
Annex B (normative) Data-quality objectives
        (source: Annex VIII of [2])
Annex ZA (informative) Relationship with EU Directives
Bibliography

This European Standard describes a standard method for determining the PM2,5 mass concentration of suspended particulate matter in ambient air by sampling the particulate matter on filters and weighing them by means of a balance.Measurements are made over a sampling period of about 24 h, and in line with the Directive, are expressed as µg/m3, where the volume of air is the volume at ambient conditions near the inlet at the time of sampling.The range of application of the standard is from 1 µg/m3 (i.e. the limit of detection of the standard measurement method expressed as its uncertainty) up to 120 µg/m3 (i.e. the maximum concentration level observed during the field study undertaken by CEN/TC 264/WG 15 to validate the standard).NOTE Although the standard is not validated for concentrations over 120 µg/m3, its range of application could well be extended to commonly encountered ambient concentrations up to circa 200 µg/m3 when using glass or quartz fibre filters. At these high concentrations and particulate mass loadings no filter clogging is to be expected. Also the flow rate can be easily maintained at the nominal setting.The equivalence procedure in Annex A specifies two approaches, depending on whether the candidate method differs slightly or fundamentally from the standard method.In the former case, involving only slight differences from the standard method ("variations on a theme") Annex A provides a restricted procedure to compare only the pertinent differences, instead of a full field test. This part of the annex serves to give practical guidance for determining equivalence for measurement methods commonly used in monitoring networks, and includes examples of common variations to the standard method, such as different filter storing or conditioning procedures and the variation of the standard method for the application as automated filter changer.