If you have never arranged an indoor air quality assessment, it can be difficult to know what to expect. Which areas will be checked? Will samples be collected? What will the results tell you?

The process starts by defining the concern. Indoor air quality investigations can involve several contributing factors, so the assessment should be designed around the building and the question being asked. Source: CCOHS indoor air quality guidance.

Before the visit

The consultant may ask about odours, affected locations, the timing of concerns, recent renovations, water damage, and building operations.

Existing drawings, maintenance records, or previous reports may also help. This background information guides the scope of the assessment.

During the assessment

A site visit may include a walkthrough, discussions with building representatives, and observations of ventilation, occupancy, moisture, or potential contaminant sources.

Measurements could include temperature, relative humidity, or carbon dioxide. Targeted contaminant sampling may be appropriate when there is a specific reason to collect it.

Testing should answer a defined question. There is no single measurement that captures every aspect of indoor air quality, and an investigation does not always require laboratory samples. Source: Health Canada guidance for office buildings.

After the visit

Some instruments provide readings immediately. Other samples require laboratory analysis.

The findings should be interpreted alongside observations and building conditions. Results describe the locations, times, and circumstances assessed; they cannot guarantee conditions throughout a building at all times.

Understanding the report

A useful report explains what was assessed, how the work was completed, what the findings mean, and what further action may be appropriate.

Before booking, discuss access requirements, expected timing, deliverables, and any preparation needed.

Have questions about your building’s air quality? Contact IES to discuss an assessment suited to your concern.