ISO 16000-26:2012

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
• Environmental & indoor air consultants planning CO2 surveys and diagnostic investigations
• Occupational health & safety teams verifying indoor exposure related to occupancy and productivity
• Laboratories and field technicians implementing standardised sampling protocols
• Facility planners and public institutions (schools, offices, hospitals) using CO2 monitoring to guide ventilation strategies

Common applications include evaluating ventilation requirements, screening classrooms and offices, diagnosing poor air exchange, and validating ventilation improvements.

Related standards

• ISO 16000-1:2004 - General aspects of sampling strategy (core reference)
• Other parts of ISO 16000 series covering VOCs, formaldehyde, NO2, moulds and sampling strategies for indoor pollutants

Keywords: ISO 16000-26:2012, CO2 sampling, indoor air quality, sampling strategy, CO2 measurement, NDIR, photoacoustic spectroscopy, ventilation requirement.