## 5 Results and Discussion  
In Portugal, the majority of indoor environments have natural ventilation. The nature of dwelling, construction, heating and ventilation assumes an important influence on the air permeability variations. It is expected that over 66% of business/services constructions which support natural ventilation mechanisms are notably airtight, and the other 33% have a tendency to be leakier. For testing purposes, one laboratory of a Portuguese university were on-site supervised using one _iAQ+_ prototype. Figure 6a presents the experiment conducted by the authors of LEC supervision of thermography activities. As in most laboratories, the supervised space incorporates natural ventilation and does not have dedicated ventilation slots on the facades. The indoor air is reheated and recirculated through a couple of standard air-water fan-coils of the heating system, and the air exchange is performed through infiltrations and by opening windows manually. The outdoor air is employed to afford ventilation, to reduce the temperature or when the occupants detect the severe or disturbing odour; therefore, the IAQ is frequently deficient. The _iAQ+_ was powered by the power grid using a 230V-5V AC-DC 2A power supply. The LEC exposure data were collected in thermography experiments which showed that indoor conditions can be different from the recommended values and can affect the integrity of the collected data. The tests conducted show the system capability not only to keep a healthful and productive workplace for the students, teachers and the school staff but also to provide a consistent and regulated state of control for laboratory activities. Figure 6b represents the laboratory space used as a schoolroom. Figure 7 presents a sample of the graphics of the results achieved in the tests conducted. It should be noted that the graphs displayed the results obtained in the monitored rooms with induced simulations using tobacco smoke. On one hand, monitoring environmental conditions and maintaining laboratory temperature and humidity requirements is extremely important for high-quality experimental activities. On the other hand, supervising IEQ is significant in creating a healthy and productive workplace for learning and teaching. Using the smartphone application, the user can carry all the monitored data in his pocket. This solution not only supports alerts and setpoints configuration for real-time notifications via e-mail, SMS and push notifications but also provides an integrated dashboard for the monitored real-time collected data. Quite apart from this, the _iAQ+_ incorporates a built-in visual and audio alarm, two LED's and a buzzer respectively. When the configurated setpoints are met, the correspondent LED is triggered, green to inform the good IEQ status and red to notify the poor IEQ status along with the buzzer activation. In the last case, the buzzer will ring for 30 seconds with the aim to notify the occupants to act in real-time to enhance the indoor conditions. Figure 6: Laboratory layout: (**a**) experiments research area (e.g. thermography experiments supported by _iAQ+_); (**b**) classroom learning space (teaching support). The data collected by the system is analysed before being inserted into the database. If the data exceeds the parameterised limits, the user is notified and an email or SMS is triggered (Figure 8). The SMS notification is performed using Twilio, a cloud communication platform, as a service. This service makes it possible to programmatically send an SMS and other communication functions using its Web service APIs. The push notifications are performed using the Firebase Cloud Messaging that is a cross-platform solution for messages and notifications for Android, iOS and Web applications. The real-time alerts promote behaviour changes. In fact, these messages alert the user to act in real-time to perform actions to increase IAQ.