Indoor Air Quality (IAQ) Assessments
Improve comfort, wellbeing and confidence in your ventilation strategy with independent Indoor Air Quality (IAQ) assessments and monitoring. We help building owners, occupiers and managers across Greater London, the South East and the wider UK identify poorly ventilated areas, understand indoor pollutants and turn findings into practical improvements.
- Identify under-ventilated rooms and peak-occupancy issues using appropriate CO₂ monitoring and ventilation insights
- Clear, actionable recommendations (no/low cost actions + longer-term upgrade options) in plain English
- Support for single buildings and UK-wide portfolios across offices, retail, education and mixed-use sites
- Join up IAQ with wider building performance and compliance work (TM44 / ESOS / SECR and energy efficiency)
What is IAQ and who needs an assessment?
An IAQ assessment is a structured review of the air your occupants breathe. It typically combines measurements and/or continuous monitoring with a review of ventilation strategy, filtration, occupancy patterns and controls to identify root causes and prioritise improvements.
From a workplace perspective, ventilation is a legal duty: under Regulation 6, employers must ensure that every enclosed workplace is ventilated by a sufficient quantity of fresh or purified air. Health and Safety Executive+1
You’ll typically benefit from an IAQ assessment if:
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Occupants report stuffy rooms, drowsiness, odours, headaches or recurring comfort complaints
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Changes to occupancy, layout, operating hours or HVAC settings have been made
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You’re refurbishing / fitting out and want to manage VOCs and particulates
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Evidence-led action is required that balances healthy air with energy performance
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You manage a portfolio and need a consistent way to prioritise improvements across sites
What we assess under IAQ
Your scope depends on building type and objectives. A typical IAQ assessment may include:
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CO₂ (ventilation indicator) – used as a broad guide to ventilation effectiveness Health and Safety Executive
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Particulates (PM2.5 / PM10) – filtration performance, outdoor ingress and indoor sources
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VOCs – cleaning products, fit-out materials, furnishings, processes and storage
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Temperature & relative humidity – comfort stability and moisture/mould risk drivers
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Ventilation operation in practice – zoning, schedules, setpoints, demand control logic and maintenance effects
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Filtration review – suitability, condition and opportunities to improve effectiveness (without unnecessary energy penalty)
Our IAQ assessment service
We provide an end-to-end service from scoping through to a clear improvement plan.
What you get:
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IAQ scoping + monitoring approach (spot checks vs multi-day monitoring)
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Simple site data request (floor plans, occupancy patterns, ventilation type, operating hours)
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Measurements / monitoring deployment and representative data capture
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Clear results summary (what’s OK / what needs attention)
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Prioritised action plan: quick wins + medium-term improvements + capex options
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Optional verification monitoring to confirm improvements worked
Step 1 – Scope and monitoring approach
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Confirm your objectives (complaints, due diligence, verification after works, portfolio benchmarking)
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Agree locations, monitoring duration and parameters
Step 2 – On-site survey and data capture
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Deploy monitoring and capture occupied-period performance
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Record operational patterns (windows/doors behaviour, meeting room demand, schedules, controls)
Step 3 – Analysis, priorities and recommendations
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Identify root causes (ventilation, occupancy, controls, filtration, sources, moisture drivers)
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Provide a clear “do this first” improvement plan
Step 4 – Verify and embed (optional)
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Re-test after changes
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Set up lightweight ongoing monitoring for priority spaces (meeting rooms, teaching spaces, high-use zones)
Practical guidance on CO₂ monitoring (what “good” looks like)
Where CO₂ monitoring is appropriate, HSE notes it’s a broad guide to ventilation rather than demonstrating “safe levels”. As a practical action threshold, CO₂ levels consistently higher than 1500 ppm in an occupied room indicate poor ventilation and you should take action to improve it. Health and Safety Executive+1
Why choose Smart GreenTech Solutions for IAQ?
Smart GreenTech Solutions is an independent building performance and sustainability consultancy, established in 2011, with specialist experience spanning IAQ, TM44 inspections, ESOS audits, SECR reporting and energy efficiency, so your IAQ work can join up with compliance and performance priorities.
Organisations choose us for IAQ because we offer:
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Ventilation and controls expertise (not just “sensor readings”)
We translate data into operational and engineering actions that actually fix the problem. -
Root-cause focus
We don’t just highlight issues—we identify what’s driving them and how to resolve them. -
Clear, board-friendly reporting
Concise outputs in plain English (the same approach used across our ESOS/SECR/TM44 work). -
Portfolio delivery
Consistent approach across multiple sites to reduce internal admin time.
IAQ FAQs
Our Industry Accreditations & Registrations
Check out our IAQ and related articles
Read through our articles and case studies on IAQ, ventilation performance and building optimisation.
Ready to talk about IAQ?
Whether you need to investigate persistent comfort complaints, benchmark IAQ across your estate, or verify ventilation improvements, we’re here to help.
If your TM44 certificate is due to expire, you’re not sure whether your system is over 12 kW, or you simply want a more efficient and reliable air conditioning system, we’re here to help.
Call us: +44 (0) 3300 881451
Email:
Or: complete our short form to request a free IAQ consultation
We’ll review your situation, outline the likely scope of work and timescales, and propose a practical plan to improve occupant experience while protecting building performance.