Indoor air investigations
Indoor air investigations for UK commercial buildings
When occupants report complaints or a building is suspected of underperforming, a structured investigation isolates the environmental factors at play — combining continuous sensors, lab-grade sampling and ventilation review into a single defensible report.
What we investigate
The four investigation pillars
Most building-related complaints are explained by a small set of measurable factors. Investigation is the disciplined process of ruling each in or out with calibrated data rather than assumption.
CO₂ / Δp
Outdoor air supply vs occupancy load.
TVOC / HCHO
Material emissions and cleaning chemistry.
PM2.5 / PM10
Outdoor ingress and indoor sources.
T / RH
Thermal envelope and humidity control.
Complaint mapping
Occupant reports plotted against zone, shift and HVAC mode to focus the sensor plan.
Continuous monitoring
Multi-zone sensors capture diurnal patterns the eye and nose miss.
Targeted sampling
Sorbent tubes, DNPH cartridges and viable mould samples for laboratory analysis.
Findings report
Plain-English conclusions, prioritised actions and benchmark comparison.
When to investigate
Triggers for a formal indoor air investigation
Persistent occupant complaints, post-refurbishment concerns, suspected ventilation underperformance, or due-diligence requirements ahead of a lease event. Investigations are also used to verify remedial works after HVAC, fabric or cleaning regime changes.
Pair an investigation with indoor air quality monitoring, indoor air quality testing and indoor environmental monitoring for a complete picture.
Benchmarks
Reference frameworks used in investigations
| Reference | Scope | Use |
|---|---|---|
| WHO IAQ Guidelines (2010 / 2021) | Pollutant exposure limits | Health benchmarking |
| BS EN 16798-1 | Indoor environmental categories | Building classification |
| CIBSE TM40 / Guide A | Ventilation and comfort | Design vs measured gap |
| WELL v2 / RESET Air | Continuous monitoring | Occupant-facing targets |
| HSE INDG244 | Workplace temperature | Statutory comfort guidance |
Commission an indoor air investigation
Structured monitoring, sampling and reporting that answers the question on the table.
Request a quoteMeasurement services
Specific parameters