Exposure assessment
Indoor air exposure & environmental risk assessment
An exposure assessment quantifies what occupants are actually breathing over a working day — and benchmarks it against WHO, WELL and BS EN 16798 references. It is the basis for defensible decisions on ventilation, materials and cleaning regimes.
Assessment scope
What is quantified
An exposure assessment moves beyond a snapshot. We capture time-weighted averages, peak excursions and the proportion of occupied time spent above each reference.
8-hour mean
Time-weighted average over the working day.
15-min max
Short-term excursions linked to activity.
Exceedance time
Share of occupied hours above target.
Diurnal
How exposure varies through the day and week.
Multi-parameter monitoring
CO₂, PM2.5, PM10, TVOC, HCHO, T and RH captured continuously across representative zones.
Laboratory analysis
Speciated VOCs by TD-GC-MS and formaldehyde by DNPH/HPLC for defensible numbers.
Risk framing
Findings framed against WHO, WELL, BS EN 16798 and HSE references — without overstating health implications.
Documented report
Concise written report suitable for facilities, HR, design teams and lease-event due diligence.
When to use
Where exposure assessment is the right tool
Pre- and post-refurbishment verification, lease-event due diligence, response to occupant complaints, WELL and BREEAM submissions, and any situation where a written, defensible characterisation of indoor exposure is required.
Combine with indoor air investigations, indoor environmental monitoring and indoor air pollution testing.
Benchmarks
Reference frameworks applied
| Reference | Application | Output |
|---|---|---|
| WHO IAQ Guidelines (2010 / 2021) | Health-based exposure limits | TWA comparison |
| BS EN 16798-1 | Indoor environmental categories | Category I–IV rating |
| WELL v2 Air | Occupant-facing targets | Performance verification |
| BREEAM Hea 02 | Pre-handover IAQ | Compliance evidence |
| HSE INDG244 / Workplace Regs | Temperature & basic comfort | Statutory check |
Commission an exposure assessment
Quantify occupant exposure, benchmark against recognised references and act on the findings.
Request a quoteRelated investigations
Measurement