Overview
EN ISO 16000-15:2008 - Indoor air. Part 15: Sampling strategy for nitrogen dioxide (NO2) specifies how to plan and design indoor NO2 measurements. It focuses on the sampling strategy (when, where and how to sample) because measurement results can drive remedial actions or be used to verify mitigation. The standard links ISO 16000‑1 (general sampling strategy) with the practical analytical procedures for NO2 testing and includes guidance on pre‑testing, short‑ and long‑term measurements and quality assurance.
Key topics and requirements
- Sampling strategy planning: Define measurement objectives, boundary conditions and the required level of confidence before sampling.
- Measurement types: Guidance on short‑term and long‑term measurements and when each is appropriate.
- Sampling period & frequency: Select sampling duration and frequency consistent with objectives (screening, compliance check, exposure assessment).
- Measurement location: Criteria for choosing sampling positions representative of occupant exposure and sources (kitchens, rooms with combustion appliances, ventilation inlets).
- Measurement uncertainty & reporting: Consider uncertainty in planning and present results with appropriate context.
- Quality assurance (QA): Implement QA/QC procedures to avoid misrepresentation or erroneous results.
- Pre‑testing & screening: Use preliminary tests to refine strategy (examples provided in annex).
- Diffusive samplers: Informative annex on the use and considerations for diffusive (passive) samplers for NO2.
- Properties & sources of NO2: Overview of NO2 formation (combustion sources, unflued appliances) and factors affecting indoor concentrations (air change rate, outdoor NO2). The standard cites literature ranges for indoor NO2 (under 10 µg/m3 up to ~800 µg/m3 reported). Conversion note: 1 mg/m3 ≈ 0.53 ppm at 293 K, 1.013 bar (as referenced).
Practical applications
- Designing NO2 monitoring campaigns for indoor air quality (IAQ) assessments.
- Assessing occupant exposure and health risk from combustion sources (cooking, heating, unflued appliances).
- Verifying effectiveness of remediation, ventilation improvements or appliance replacement.
- Supporting regulatory or advisory investigations by environmental consultants, public‑health authorities and laboratories.
- Guiding selection between active vs passive sampling and determining appropriate sampling duration and frequency.
Who should use this standard
- Indoor air quality professionals and consultants
- Environmental and analytical laboratories performing NO2 analysis
- Building engineers, HVAC/ventilation specialists and facility managers
- Public‑health agencies and policy makers designing IAQ programs
Related standards
- ISO 16000‑1: General aspects of sampling strategy (normative reference)
- Other ISO 16000 series parts covering formaldehyde, VOCs, sampling methods, and QA (e.g., Parts 2–7, 9–14 listed in the ISO 16000 series).
Keywords: EN ISO 16000-15, Indoor air, sampling strategy, nitrogen dioxide, NO2, diffusive samplers, indoor air quality, measurement planning, measurement uncertainty, quality assurance.