Overview
ISO 16000-26:2012 - "Indoor air - Part 26: Sampling strategy for carbon dioxide (CO2)" specifies how to plan and organise measurements of carbon dioxide (CO2) in indoor environments. The standard emphasizes that a carefully designed sampling strategy is essential because measurement results can determine the need for remedial action or verify the success of ventilation and control measures. ISO 16000-26:2012 links general guidance from ISO 16000‑1 to CO2-specific measurement planning and is explicitly not applicable to carbon monoxide (CO) measurement.
Key topics and requirements
ISO 16000-26:2012 focuses on practical elements of CO2 indoor air monitoring and includes:
- Measurement planning: define the measurement objective, boundary conditions and the purpose of the assessment (screening, compliance check, verification of remediation).
- When to measure: guidance on timing relative to occupancy patterns and ventilation operation to capture representative conditions.
- Measurement location and period: rules for selecting sampling points and duration to reflect typical exposure or to characterise ventilation performance.
- Measurement techniques: describes common CO2 measurement methods such as non-dispersive infrared (NDIR) and photoacoustic spectroscopy (PAS), noting instruments can provide continuous determinations in the typical indoor range.
- Measurement uncertainty & result presentation: account for instrument limitations, cross-sensitivities (e.g., water vapour), and report presentation.
- Quality assurance and test reporting: procedures to ensure data reliability and clear documentation of the sampling strategy and results.
- Supporting material: Annex A (calculation of ventilation requirement), Annex B (regulations), and examples of screening tests and continuously registering devices (Annex C).
Practical applications and users
ISO 16000-26:2012 is intended for professionals involved in indoor air quality (IAQ) assessment and ventilation management:
- HVAC engineers and building managers assessing ventilation adequacy and occupant comfort