Indoor air quality monitoring.

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What is indoor air quality monitoring?

Indoor Air Quality (IAQ) Monitoring measures the concentration of airborne contaminants, temperature, humidity, and ventilation performance within a building. These factors directly influence health, comfort, and productivity. Left unmanaged, poor air quality can lead to occupant complaints, health issues, and potential breaches of regulatory standards.

At Complii, our specialists use advanced monitoring equipment to measure key air quality indicators — including carbon dioxide (CO₂), carbon monoxide (CO), particulate matter (PM₂.₅ and PM₁₀), temperature, humidity, and volatile organic compounds (VOCs). We deliver clear, actionable reports with practical recommendations that help you maintain a safe and healthy indoor environment for everyone who uses your building.

We're an accredited contractor

Why choose Complii?

How we can help.

Protect your people, property, and business. Here’s why we’re the right choice for indoor air quality monitoring.

Healthier indoor environments

Protect staff and visitors from exposure to airborne pollutants, allergens, and irritants, supporting overall wellbeing and reducing absenteeism.

Regulatory assurance

Demonstrate compliance with Workplace (Health, Safety and Welfare) Regulations 1992 and Health and Safety Executive (HSE) guidance on indoor environments.

Improved comfort and productivity

Maintain balanced temperature, humidity, and CO₂ levels to create a more comfortable and productive workplace.

Energy and cost efficiency

Identify ventilation inefficiencies and optimise system settings to reduce energy use and associated costs.

Data-led decision making

Receive detailed reports with trends, benchmarks, and evidence to guide maintenance planning and air quality management.

Early issue detection

Spot ventilation or filtration faults before they escalate, ensuring systems continue to operate efficiently and safely.

Your questions answered.

Indoor air can often be more polluted than outdoor air due to emissions from furniture, cleaning products, and poorly maintained ventilation systems. Monitoring identifies these risks before they affect health or comfort.
We recommend annual testing, or more frequent assessments for high-occupancy or high-risk environments such as hospitals, laboratories, and manufacturing sites.
Our IAQ surveys assess carbon dioxide, carbon monoxide, particulate matter, temperature, humidity, and volatile organic compounds (VOCs). Additional testing can be included where required.
IAQ monitoring supports compliance with the Workplace (Health, Safety and Welfare) Regulations 1992, HSE guidance, and relevant CIBSE standards.
No. All monitoring is completed discreetly and safely while your site remains operational. Results are delivered in a concise report with clear recommendations.
Yes. We offer periodic and continuous monitoring solutions, enabling you to track trends, compare results over time, and demonstrate proactive management of indoor environments.Protect the health, comfort, and productivity of your workplace with professional Indoor Air Quality Monitoring from Complii. Our accredited engineers deliver accurate, data-led assessments to help you maintain safe, efficient, and compliant indoor environments.

News & insights

News / November 1, 2025

Introducing Complii: A new chapter in building safety and compliance

For years, navigating the world of building safety and regulatory compliance has felt complicated and fragmented. You might work with one specialist for your fire systems, another for water quality, and yet another for electrical testing. It's a system that creates administrative waste, unnecessary risk, and makes it hard to get a complete, clear picture of your building's health.

Insights / September 23, 2025

The benefits of thermographic imaging

Thermographic imaging is a powerful tool for identifying potential electrical faults before they become serious problems. By using specialist thermal cameras, engineers can detect heat patterns that indicate issues such as overloading, loose connections, or failing components.

For businesses, this proactive approach helps reduce risks, avoid costly downtime, and demonstrate compliance with electrical safety regulations.

News / September 23, 2025

PH Water and Air Technologies joins Complii

We are pleased to announce that PH Water and Air Technologies has joined Complii. This addition strengthens our water and air compliance services and further supports our mission to provide trusted, integrated compliance solutions across the built environment.

See all news and insights

Compliance with confidence.

Get in touch for a tailored quotation that fits your site’s needs.