Indoor bacterial load and its correlation to physical indoor air quality parameters in public primary schools

High bacterial load was found in public primary schools in the Gondar city as compared to different indoor air biological standards. Temperature, relative humidity and particulate matter concentration (PM2.5 and PM10) were associated with the indoor bacterial load. <i>Staphylococcus aureus, Coagulase-negative Staphylococcus species</i> and <i>Bacillus species</i> were among isolated bacterial species. Attention should be given to control those physical factors which favour the growth and multiplication of bacteria in the indoor environment of classrooms to safeguard the health of students and teachers in school.