Indoor air quality in primary schools in Keçiören, Ankara

Results: Schools near heavy traffic had a statistically significant mean average of CO and SO 2 (P < 0.05). The classrooms that had more than 35 students had higher and statistically significant averages of CO 2 , SO 2 , NO 2 , and formaldehyde compared to classrooms that had fewer than 35 students (P < 0.05). Of all classrooms, 29% had 100 CFU/100 mL and higher concentrations of microorganisms, which were not pathogens. Conclusion: Indoor air quality management should continually be maintained in primary schools for the prevention and control of acute and chronic diseases, particularly considering biological and chemical pollution.