New Research Into Indoor Air Quality In Commercial Buildings
A field-based study measuring CO₂, particulate matter, and VOC levels across two commercial HVAC systems in a real-world South Australian setting — with findings relevant for engineers, consultants, and building owners.
Why Indoor Air Quality Is Becoming A Commercial Building Priority
As occupant wellbeing, building ratings, and regulatory expectations converge, commercial HVAC systems are under greater scrutiny than ever before. IAQ is no longer a secondary consideration.
Outdoor air delivery rates directly influence CO₂ accumulation and the dilution of airborne contaminants. How a system handles fresh air exchange has significant implications for the indoor environment.
Building occupants spend the majority of their time indoors. CO₂ concentration, humidity, and particulate levels all influence thermal comfort, perceived air freshness, and reported satisfaction.
PM2.5, PM10, and volatile organic compounds can accumulate in commercial environments — particularly in food service and high-occupancy settings — and are increasingly subject to measurement and reporting requirements.
Standards including ASHRAE 62.1, WELL, NABERS IAQ, and Green Star are placing greater emphasis on demonstrable indoor air quality outcomes — creating new obligations for engineers and building owners.
Green building certifications, ESG commitments, and tenant expectations are driving demand for verified, data-supported claims about indoor environment quality — not just energy efficiency or thermal comfort alone.
Key Research Findings: Measured IAQ Results
The following results were recorded in the study environment under the conditions tested. They represent field-measured data and should not be interpreted as guaranteed outcomes for every application.
The indirect evaporative cooling system delivered higher outdoor air exchange rates throughout the study period under the conditions tested.
RH was maintained within ranges associated with occupant comfort during the measurement period in this study environment.
Measured results showed stronger alignment with emerging IAQ benchmarks compared to the reverse cycle configuration in the same environment.
What The Research Report Covers
The full report provides detailed findings, methodology, and implications for commercial building ventilation and specification decisions.
An overview of how different HVAC approaches — and their outdoor air delivery rates — affect the concentration of CO₂ and contaminants within a commercial environment.
Full methodology, sensor placement, and measurement approach used in the study — including data tables, monitoring periods, and confidence in results.
How each system performed against recognised ventilation benchmarks and what that means for effective dilution of indoor air contaminants.
What the data may mean for system specification and building design — and the questions engineers and consultants should be considering when evaluating IAQ performance.
An overview of relevant standards (ASHRAE 62.1, WELL, NABERS IAQ, Green Star) and how the measured results align with current and emerging requirements.
Guidance on limitations of the study, areas for further investigation, and how professionals can apply these findings appropriately in their own projects.
CO₂ · PM2.5 · PM10 · VOC measurements · Ventilation effectiveness · IAQ standards alignment
Download The Full Research Report
The complete report includes all field measurements, methodology, data tables, and practical commentary on what the findings may mean for commercial building specification and design.
- Full CO₂, PM2.5, PM10, and VOC data tables from the study
- Measurement methodology and sensor placement details
- Outdoor air delivery rate comparisons between systems
- Relative humidity measurements across the study period
- Assessment against recognised IAQ benchmarks and standards
- Commentary on commercial building design implications
- Study limitations and guidance for professional application
Why This Research Is Relevant To Your Work
IAQ research is most useful when it translates to actionable knowledge. Here is how the findings are relevant across key commercial disciplines.
As IAQ expectations appear in project briefs and performance contracts, field-measured data helps inform specification decisions and provides a stronger evidential basis for system selection conversations.
Understanding how HVAC strategy affects IAQ outcomes enables architects to collaborate more effectively with engineers — and to design buildings that meet evolving occupant experience and certification expectations.
The study results provide a useful reference point for evaluating current ventilation performance. Where further assessment is warranted, the data supports a more structured conversation with technical advisors.
IAQ disclosure requirements and green building ratings are expanding in scope. Understanding the performance implications of different HVAC approaches supports better long-term asset decisions.
Indoor environment quality is increasingly recognised alongside carbon and energy metrics in sustainability frameworks. This research offers data points relevant to occupant-focused ESG reporting and certification.