According to international research, indoor air pollution in buildings can reach levels two to five times higher than outdoor air. The World Health Organization reports that air pollution ranks among the top environmental threats to global health. Despite this, many organisations still underestimate the issue, even though people spend up to 90% of their time inside workplaces.
For companies, indoor air pollution represents a growing risk that directly affects health, well-being, and productivity. Understanding where it comes from and applying the right measures helps organisations create healthier, more efficient, and more sustainable workplaces.
This article explores the main sources of indoor air pollution and presents the most effective strategies to reduce or eliminate it.
What indoor air pollution is and why it matters for organisations
Indoor air pollution includes all substances and environmental conditions that degrade air quality inside buildings: particulate matter, VOCs, gases, uncontrolled humidity, mould, emissions from equipment, and even factors like noise and inadequate lighting.
These elements can trigger immediate symptoms such as irritation, headaches, fatigue, and lack of concentration. They can also contribute to respiratory or allergic problems, especially in highly insulated but poorly ventilated buildings or in spaces with synthetic materials and unmaintained HVAC systems.
The main effects of indoor air pollution on health and productivity
Indoor air pollution produces tangible consequences: exposure to high levels of carbon dioxide, VOCs, or humidity can cause irritation, respiratory infections, or aggravate pre-existing conditions.
This situation affects both absenteeism and performance, reducing cognitive function and concentration levels.
Indoor air quality also impacts energy use and operating costs
Buildings that rely on poor ventilation or inefficient climate control systems consume more energy and require constant corrective actions.
Investing in better air quality helps organisations reduce energy waste, extend the lifespan of their systems, and keep environmental conditions more stable over time. It also prevents unexpected anomalies and consumption peaks, enabling more accurate maintenance planning.
Sources of indoor air pollution: where they come from and how to recognise them
Indoor air pollution results from a combination of internal and external sources. Identifying them is the first step to applying the right countermeasures.
Particulate Matter (PM): internal and external origins
Fine particulate matter (PM1, PM2.5, PM10) is one of the most critical pollutants because it can reach deep into the respiratory system.
Where particulate forms inside buildings
- laser printers and photocopiers;
- cooking activities in kitchens or canteens;
- abrasive materials;
- maintenance operations.
Where particulate comes from outside
- road traffic;
- construction sites;
- combustion sources;
- adverse weather conditions.
Indoor PM levels rise during peak occupancy and when ventilation remains insufficient.
Carbon Dioxide (CO₂): why it is a key indicator of air quality
CO₂ is not toxic, but it clearly indicates whether a space receives enough fresh air. Concentrations above 1000 ppm can cause:
- reduced attention;
- decision-making difficulties;
- fatigue;
- a feeling of stale air.
The most critical situations occur in highly frequented rooms or in compact spaces.
Volatile Organic Compounds (VOCs): what they are and where they originate in indoor environments
VOCs come from:
- paints and coatings;
- furniture;
- glues and solvents;
- cleaning products;
- electronic devices.
These compounds build up easily in well-insulated or poorly ventilated buildings. Monitoring them becomes essential.
Nitrogen Dioxide (NO₂), Carbon Monoxide (CO), and Ozone (O₃): chemical pollutants entering indoor spaces
NO₂, CO and O₃ enter buildings through:
- outdoor traffic;
- combustion processes;
- leakages from garages or technical rooms.
Monitoring these pollutants is especially important in dense urban areas.
Humidity, temperature, and mould: when microclimate becomes a risk
Humidity that rises above 60% or drops below 30% encourages microbial growth and creates discomfort.
Unbalanced temperatures affect comfort and increase energy use.
Noise and lighting: invisible but impactful forms of pollution
Poor lighting or excessive noise affects concentration and well-being, contributing to the perception of an uncomfortable workspace.
Space occupancy: why it influences air quality
Crowding increases CO₂, VOCs, temperature, and noise levels. Without reliable occupancy data, ventilation and air exchange cannot be optimised effectively.
Indoor air pollution remedies: the most effective strategies
Reducing indoor air pollution requires a coordinated approach that integrates technology, maintenance, and organisational awareness.
Continuous monitoring and data analysis to take targeted action
Air management starts with measurement. Advanced monitoring systems track CO₂, PM, VOCs, temperature, and humidity, providing a clear picture of environmental conditions.
Data helps organisations:
- identify pollution sources;
- understand trends throughout the day;
- intervene only when necessary;
- optimise HVAC and VMC systems;
- verify the effectiveness of interventions;
- generate useful reports for the facility, HR, and ESG teams.
How to optimise ventilation and air exchange
Inefficient ventilation encourages the accumulation of CO₂ and VOCs. Organisations can improve air renewal by:
- enhancing air supply and extraction;
- installing heat-recovery ventilation systems;
- adjusting ventilation based on real occupancy;
- automating air inlets and recirculation;
- adapting the system to actual CO₂ levels.
Filtration and HVAC maintenance: why they matter
Dirty filters or poorly calibrated systems spread particulate and bacteria. Effective remedies include:
- using high-efficiency filters;
- scheduling cleaning and inspections;
- calibrating airflow correctly;
- using IoT sensors to detect anomalies and trigger alerts.
Reducing indoor pollution sources inside buildings
Many pollutants – from VOCs to particulate matter and chemical residues – originate inside buildings. To reduce them, organisations can:
- choose low-emission furniture and materials;
- avoid high-VOC paints and glues;
- use non-aerosol cleaning products;
- isolate printers and electronic devices;
- improve ventilation in technical rooms.
Managing flows and occupancy with smart technologies
Occupancy sensors adjust ventilation based on real presence levels, ensuring that air exchange aligns with actual usage patterns.
This approach prevents overcrowding, maintains stable comfort conditions and helps optimise HVAC performance.
Flow analysis throughout the day also provides insights to reorganise layouts more efficiently.
Promoting culture, policies, and good practices
People influence indoor air quality. More organisations now introduce “air wellness” policies, training on proper space usage, transparent IAQ communication, and dedicated reporting tools for critical areas.
These initiatives encourage awareness and support a shared responsibility for indoor environmental wellbeing.
Linking IAQ and energy efficiency: a shared advantage for people and buildings
Many still believe that ventilation and air renewal inevitably increase energy consumption. This assumption does not hold true.
When managed intelligently, these systems improve air quality and reduce energy use.
Heat-recovery ventilation combined with real-time data avoids unnecessary losses, stabilises comfort, and limits consumption peaks.
By analysing IAQ parameters, occupancy levels, and space usage trends, organisations activate systems only when needed – reducing operating hours and modulating output.
An integrated model to eliminate indoor air pollution: the Aircare’s role
Managing indoor air pollution requires consistency and data-driven decisions. It goes beyond checking a few parameters or adjusting HVAC settings when problems arise. It means building a system where data, maintenance, processes, and technology work together to keep environments healthy, comfortable, and safe.
When organisations correlate air quality, space occupancy, energy use, and system performance, they reduce waste, prevent risks, and plan interventions more effectively.
The benefits are clear: lower operating costs, better productivity, improved employee experience, and easier alignment with international building wellbeing and efficiency standards.
Aircare plays a key role in this process. Our solutions integrate multi-parameter monitoring, advanced analytics, and tools for dynamic space management.
By connecting air quality, occupancy, and energy performance, we help organisations turn data into action, keep systems efficient, and create workplaces designed around people’s wellbeing.To learn more, you can request a free demo and schedule a meeting with a member of our team.