Indoor air quality (IAQ) has gained significant importance by affecting health and occupational safety with the increase in time spent in indoor environments. In this study, IAQ at Çanakkale Onsekiz Mart University Biga Vocational School was evaluated and air pollutants such as particulate matter (PM), total volatile organic compounds (TVOC) and formaldehyde (HCHO) were examined in various indoor areas such as classrooms, canteen, corridors, laboratories and conference hall. Measurements were carried out using PCE RCM 15 Air Quality Measurement Instrument over multiple periods. The results show that PM concentrations were generally within acceptable limits but increased with student density and long-term occupancy. The intermittent exceedance of recommended TVOC thresholds underscores the necessity for enhanced ventilation strategies, particularly during periods of peak occupancy. HCHO levels remained low, indicating appropriate material selection in building construction and furnishing. The study emphasizes the necessity of periodic monitoring, optimized ventilation and awareness programs to improve indoor air quality and provide a healthier learning environment. Additionally, indoor temperature and humidity values were also measured and evaluated. The measurement results are thoroughly analyzed in the final section.