Independent indoor air quality assessors · Since 1999
Indoor Air Quality Testing and Assessment
Our indoor air quality assessments tell you what occupants are actually breathing, why, and what to do about it. We measure the parameters that matter for the question you need answered — routine assurance, a complaint, a certification requirement or a whole-building review — and give you clear, evidence-based actions.
Established 1999 · 2,500+ assessments · SafeContractor approved · BOHS Affiliate Member · London & South East
Our Indoor Air Quality Testing and Assessment Services
Office Air Quality Testing
Targeted IAQ surveys for office environments measuring CO₂, VOCs, particulates, and thermal comfort.
Learn moreFM Contract Monitoring
Planned monitoring programmes for FM companies managing multi-site commercial portfolios.
Learn morePreventative Monitoring
Scheduled surveys to identify issues before they become complaints or compliance failures.
Learn moreEmployee Wellbeing Testing
Air quality assessments supporting corporate wellbeing and return-to-office programmes.
Learn moreIAQ Compliance Testing
Testing for BREEAM, WELL and BS 40102-1 projects and project specifications.
Learn moreVOC & Formaldehyde Testing
TVOC screening and individual VOC species identification for offices and commercial buildings.
Learn moreCO₂ Monitoring
CO₂ monitoring to verify ventilation adequacy against CIBSE and Part F requirements.
Learn morePre & Post-Occupancy Testing
IAQ verification before handover and under occupied conditions for new or refurbished spaces.
Learn moreMulti-Site Monitoring
Standardised IAQ monitoring across multi-site property portfolios with centralised reporting.
Learn moreService Agreements
Fixed-price annual IAQ contracts covering surveys, compliance, and reactive support.
Learn moreWho Is This For?
Why This Matters
Poor indoor air quality shows up as complaints, headaches, stuffiness, odours and lost confidence in a building. Measured evidence lets you separate perception from problem, find the cause and show tenants, staff and auditors that the building is well managed.
- The Workplace (Health, Safety and Welfare) Regulations 1992 require effective and suitable ventilation
- HSE EH40 sets workplace exposure limits for specific substances
- CIBSE guidance and BS 40102-1 provide benchmarks for good indoor environmental quality
- BREEAM and WELL set indoor air quality criteria for certified buildings
Our Approach
We select instruments, locations and sampling duration for the question being investigated, not simply because a parameter is easy to measure. Real-time instruments show how conditions change through the day; laboratory analysis is used where a specific compound must be identified or a scheme requires it.
Which IAQ service do I need?
Start from the question you need answered.
| If you need to… | Survey type | Typical parameters |
|---|---|---|
| Show that a building is well managed | Routine office IAQ assessment | CO₂, PM2.5/PM10, TVOC, temperature, humidity |
| Resolve complaints about stuffiness, odours or symptoms | Reactive complaint investigation | Targeted to the complaint, plus ventilation review |
| Meet BREEAM, WELL or a project specification | Compliance testing | As the scheme requires, often formaldehyde and TVOC by laboratory analysis |
| Understand a building's overall indoor environment | Whole-building health assessment | IAQ plus ventilation hygiene and thermal conditions |
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Real-time screening or laboratory analysis?
Most surveys combine both.
Real-time monitoring
Direct-reading instruments log CO₂, particulates, TVOC, temperature and humidity continuously. They show patterns through the working day and how conditions respond to occupancy and ventilation.
Integrated and laboratory sampling
Air is sampled over a set period and analysed in a laboratory. This is used where a specific compound such as formaldehyde must be quantified, where a scheme requires it, or where real-time screening shows something that needs confirming.
How we decide what an elevated result means
A single high reading is not a verdict. We interpret results in context before recommending action.
Compare
Compare results with the relevant benchmark for the parameter and building use.
Check the pattern
Look at when and where levels rise: occupancy, time of day, ventilation operation, outdoor levels.
Identify the likely source
Relate the pattern to probable causes such as ventilation, fit-out materials, cleaning, construction or ingress from outside.
Recommend proportionate action
Operational changes first where they will work; further testing or engineering changes where they are needed.
Verify
Re-test to confirm the improvement.
What clients use the results for
Our reports are written to be used, not filed.
- Audit and compliance evidence
- Resolving occupant complaints
- Fit-out and handover assurance
- ESG and wellbeing reporting
- Prioritising ventilation improvements
Limitations and what this assessment cannot tell you
An IAQ survey describes conditions during the monitoring period, at the locations measured.
- Results reflect the occupancy, weather and ventilation operation during the survey
- Real-time sensors screen; specific compounds need laboratory confirmation
- This survey focuses on the indoor environment; for system cleanliness, see our ventilation hygiene assessments.
- Our assessments focus on the physical indoor environment and its impact on general occupant comfort.
What your report includes
- Scope, locations and monitoring period
- Results for each parameter and location
- Graphs showing change through the day
- Comparison with the relevant benchmarks
- Interpretation of likely causes
- Prioritised action plan
- Re-test recommendation
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Frequently Asked Questions
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Need Indoor Air Quality Testing?
Get a no-obligation quote. We provide IAQ testing, ventilation assessment and environmental monitoring across London and the South East.