Improving Indoor Air Quality in a University Teaching Complex: Continuous Monitoring and the Impact of Renovation Works

This study investigates whether a university teaching complex equipped with CSA S600 continuous air purification and sanitation units can maintain indoor air quality (IAQ) within recommended thresholds under real occupancy conditions and evaluates the impact of renovation works on IAQ. The work provides the first real-world assessment of the CSA S600 integrated monitoring system in an academic environment. CO2, PM2.5, PM10 and VOCs were continuously measured over three months; moreover, indoor PM10 values were compared with outdoor data from the regional monitoring network. Indoor CO2 generally remained below 800 ppm, with short peaks of 1000–1500 ppm during high occupancy. PM2.5 and PM10 consistently stayed below the latest WHO guidelines, showing uniform recurring temporal patterns overtime; furthermore, indoor PM10 showed limited coupling with outdoor trends, indicating the predominance of internal sources and ventilation dynamics. After renovation of the main Lecture Hall, particulate levels remained low, while VOCs showed a modest increase attributable to new materials. Overall, the findings demonstrate that the CSA S600 system effectively supports healthy IAQ in educational settings and that continuous monitoring is essential for managing occupancy-driven fluctuations and assessing the effects of structural interventions.