ISO 16000-42:2023
Indoor air — Part 42: Measurement of the particle number concentration by condensation particle counters
This document specifies the measurement methods and strategies for determining the total number of airborne particles per unit volume of air indoor, using a condensation particle counter (CPC) for particles approximately between 10 nm to 3 µm.
NOTE As the particle number concentration is usually dominated by the ultrafine particle (UFP) fraction, the obtained result can be used as an approximation of the UFP concentration.
Quality assurance, determination of the measurement uncertainty and minimal reporting information are also discussed in this document.
This document is applicable to indoor environments as specified in ISO 16000-1.
This document does not address the determination of bioaerosols or the chemical characterization of particles. Nevertheless, some bioaerosols can be detected by the CPC and then contribute to the measured count of particles.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviated terms
5 Sources of airborne particles
5.1 General
5.2 Combustion of organic material
5.3 Smoking
5.4 Cooking
5.5 Particle formation — Formation of secondary organic aerosol
5.6 Outdoor air
5.7 Other sources
6 Dynamics of ultrafine particles indoors
6.1 General
6.2 Infiltration and exfiltration
6.3 Deposition
6.4 Particle formation, phase transition and coagulation
7 Principle of measurement
7.1 General
7.2 Working fluid
7.3 Minimal detection size
7.3.1 General
7.3.2 Optical detection after enlargement
7.3.3 Particle size distribution
7.4 CPC minimal requirement
7.5 General sampling requirements and recommendations
8 Measurement strategy
8.1 General
8.2 Average room concentration
8.2.1 General
8.2.2 Resting state without activity
8.2.3 Resting state with equipment activity
8.2.4 Active state
8.3 Source investigation/identification
8.4 Infiltration from outdoor or connecting rooms
8.5 Measurement in vehicle cabins
8.6 Success of control and mitigation measures
9 Quality assurance and uncertainty evaluation
9.1 General
9.2 Instrument parameters
9.3 CPC’s settings check
9.4 Performance check, zero check or leak check
9.5 Uncertainty
10 Evaluation and reporting of the results
Annex A (informative) Examples of particle number concentrations encountered during room user activities
Annex B (informative) Determination of the particle number size distribution of indoor aerosol using a differential mobility aerosol spectrometer
Annex C (informative) Water-CPCs
Annex D (informative) Checklist to collect information useful for interpreting indoor measurement of particle number concentration
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Abbreviated terms
5 Sources of airborne particles
5.1 General
5.2 Combustion of organic material
5.3 Smoking
5.4 Cooking
5.5 Particle formation — Formation of secondary organic aerosol
5.6 Outdoor air
5.7 Other sources
6 Dynamics of ultrafine particles indoors
6.1 General
6.2 Infiltration and exfiltration
6.3 Deposition
6.4 Particle formation, phase transition and coagulation
7 Principle of measurement
7.1 General
7.2 Working fluid
7.3 Minimal detection size
7.3.1 General
7.3.2 Optical detection after enlargement
7.3.3 Particle size distribution
7.4 CPC minimal requirement
7.5 General sampling requirements and recommendations
8 Measurement strategy
8.1 General
8.2 Average room concentration
8.2.1 General
8.2.2 Resting state without activity
8.2.3 Resting state with equipment activity
8.2.4 Active state
8.3 Source investigation/identification
8.4 Infiltration from outdoor or connecting rooms
8.5 Measurement in vehicle cabins
8.6 Success of control and mitigation measures
9 Quality assurance and uncertainty evaluation
9.1 General
9.2 Instrument parameters
9.3 CPC’s settings check
9.4 Performance check, zero check or leak check
9.5 Uncertainty
10 Evaluation and reporting of the results
Annex A (informative) Examples of particle number concentrations encountered during room user activities
Annex B (informative) Determination of the particle number size distribution of indoor aerosol using a differential mobility aerosol spectrometer
Annex C (informative) Water-CPCs
Annex D (informative) Checklist to collect information useful for interpreting indoor measurement of particle number concentration
Bibliography