Exposure and respiratory tract deposition of particulate matter among teachers using chalkboards in selected public secondary schools in the Johannesburg region
Occupational exposure study finds airborne dust levels below safety limits in secondary school teachers, indicating low inhalation hazards from chalkboards.
Key Points
To assess particulate matter concentrations and estimate respiratory tract deposition among teachers using chalkboards in secondary school classrooms.
Monitored airborne particulate matter levels during classroom instruction among teachers using chalkboards in public secondary schools.
Evaluated exposure profiles against established occupational exposure thresholds.
Measured airborne particulate matter concentrations consistently remained below the relevant occupational exposure limit.