Air quality monitoring in smart buildings

Ensures health and sustainability in sustainable buildings

The concept of a ‘smart building’ has evolved radically. Whereas it used to be associated with lighting or security automation, today its true intelligence is measured by its ability to create dynamic environments focused on the health and well-being of the people who inhabit them. In this new era, the most advanced buildings not only react to our commands, but anticipate our needs, and nowhere is this more evident than in indoor air quality (IAQ) management.

A modern smart building functions in a similar way to the human body. Its nervous system is an extensive network of IoT (Internet of Things) sensors, which act as the building's ‘senses’, measuring countless parameters in real time. When it comes to air quality, these sensors are responsible for constantly monitoring CO₂ levels, PM2.5 particles, volatile organic compounds (VOCs), temperature and humidity in each zone. All this information is sent to the building's ‘brain’: the Building Management System (BMS).

This is where the magic happens. The BMS not only collects data, but also interprets it and makes decisions. Its main tool for action is the heating, ventilation and air conditioning (HVAC) system, which acts as the ‘lungs’ of the building. This integration gives rise to what is known as Demand Controlled Ventilation (DCV). Instead of ventilating according to fixed, pre-set schedules—an inefficient method that does not distinguish between an empty meeting room and a crowded one—the building reacts to actual conditions. If sensors detect an increase in CO₂ in an area due to increased occupancy, the BMS instructs the HVAC system to increase the flow of filtered fresh air specifically in that area and only for as long as necessary.

This proactive and granular approach is a double win. On the one hand, it ensures an optimal and healthy indoor environment at all times, improving the concentration, productivity and well-being of occupants. On the other hand, it generates massive energy savings by avoiding the air conditioning (heating or cooling) of unnecessary volumes of air. Thus, the smart building demonstrates that human health and environmental sustainability are not conflicting goals, but two sides of the same technological coin.