## 5 Results and Discussion
On the other hand, with this real-time feature, the building manager can understand when the recurrent unhealthy cases are detected and implement new adjustments to prevent them. Consecutively, _iAQ+_ provides the requirements to act in real-time for enhanced living environments and laboratory conditions. The alert indicators architecture is shown in Figure 9.  
Figure 7: Results of IAQ index, air temperature and relative humidity obtained in the experiments conducted in a real laboratory environment: (**a**) IAQ index; (**b**) relative humidity (%); (**c**) air temperature (\({}^{\circ}\)C). Firstly, _iAQ+_ can help in the maintenance of LEC by providing an integrated management system that supports daily records of historical behaviours and variations as well as remote notifications when the configurated setpoints are met. Secondly, this system can not only be used by the building manager to detect unhealthy situations in real-time but also as a decision-making tool to address behavioural changes to promote IEQ for enhanced productive environments. From a quality point of view, supervising the laboratory environment is crucial to achieving a continuous LEC in the laboratory activities. Irregular maintenance of LEC can lead to unwanted effects  
Figure 8: Examples of SMS (**a**) and E-mail (**b**) notifications. Figure 9: Alerts indicators architecture. to samples as well as to laboratory equipment's ability to produce stable results. The \(iAQ+\) allows the user to store the historical data of the LEC; therefore, it is possible to check the integrity of the collected data and perform data analysis and comparison taking into account the indoor conditions. Through charts visualisation of IEQ conditions, the application provides a better acknowledgement of the supervised data when compared to the numeric table format. Consequently, the proposed solution is a significant decision-making tool to plan interventions in order to promote a healthful and productive living environment but also for IEQ analysis. The \(iAQ+\) incorporates a wireless connection interface for Internet access along with an easy Wi-Fi network configuration. The \(iAQ+\) should be connected to a Wi-Fi hotspot for data transmission and to store the network credentials on the flash memory after successful connection. At system start-up, the \(iAQ+\) searches for a stored Wi-Fi network to connect to. However, if there no saved Wi-Fi networks available, the system will turn to hotspot mode and create a Wi-Fi network with an SSID \"\(iAQ+\)\". At this stage, the user must connect to the referred hotspot in order to configure the credentials of the Wi-Fi network to which the system will be connected (Figure 10). In this way, the \(iAQ+\) can be easily installed by the end-user which not only follows the original paradigm of IoT solutions but also contributes to the low-cost aim of the presented solution. Compared to several similar solutions proposed and described in Table 1, the \(iAQ+\) supports push notifications to alert people in a timely way for enhanced living environments and occupational health by providing ventilation, deactivation of pollutant equipment and by activating air purification systems. When the parameters meet the setpoints for the correspondent working mode, the user is alerted to ensure a productive environment for teaching or correct laboratory environmental parameters. The \(iAQ+\) offers a work mode feature; the user can configure setpoints for laboratory mode and schoolroom mode. Using the \(iAQ+\)_Mobile_, the user can easily change the work mode in real-time. On one hand, compared to other systems proposed by References [46; 47; 49; 50] based on WSN, the \(iAQ+\) provides several advantages in scalability and installation in indoor living environments as it is only necessary to configure the Wi-Fi Internet connection and it is not required to configure the sensor nodes and coordinators.