Mansour Rezazadehazari - Department of Occupational Health, School of Public Health, Shahid Beheshti University of Medical Sciences and Health Services, Tehran, Iran.
Fatemeh Sahatfardi - Department of Occupational Health, School of Public Health, Shahid Beheshti University of Medical Sciences and Health Services, Tehran, Iran.
Fatemeh Zarei - Master in Occupational Health Engineering, School of Health, Alborz University of Medical Sciences, karaj, Iran.
Sosan Salehpour - Department of Occupational Medicine, Masih Daneshvari Hospital, Shahid Beheshti University of Medical Sciences and Health Services,Tehran,Iran.
Hamid Soori - Department of Epidemiology, School of Health, School of Public Health, Shahid Beheshti University of Medical Science and Health Services, Tehran, Iran.
Mohammad Ranjbarian - Department of Occupational Health, School of Public Health, Shahid Beheshti University of Medical Sciences and Health Services, Tehran, Iran.

Background: Brick manufacturing produces dust, occupationally exposing workers to hazardous substances (e.g., silica dust). Iran is a ceramic exporter. Few studies have assessed the exposure of workers to silica dust. This study investigated occupational exposure to crystalline silica dust, total respiratory dust, and spirometry performance in traditional and mechanical brick factories. Methods: This cross-sectional study involved ۷۰ workers in two brick factories (case) and ۷۰ workers in a food industry (control) in ۲۰۱۶, who were monitored for crystalline silica and respirable dust exposure (NIOSH No.۷۶۰۲ and No.۶۰۰). The exposure of ۴۰ workers in the mechanical brick factory and ۳۰ workers in the traditional brick factory to respirable crystalline silica and dust was compared with the controls. Data were analyzed using SPSS version ۱۹. Results: The mean respirable crystalline silica and general dust exposure in the mechanical and traditional brick factories was ۰.۴۷, ۱۸.۴۳, ۰.۶۵۱, and ۲۸.۲۷ mg/m۳, respectively. The cases (brick factory) had lower FEV۱%, FVC%, FEV۱/FVC%, and PEF% indices compared to the controls. Conclusion: The mean substance exposure was above the occupational limits. The pulmonary capacities in the traditional and mechanical brick factories had no significant difference. However, the pulmonary function capacities were significantly lower than the controls.

Brick factory, Occupational exposure, Crystalline silica, Respirable dust, lung function tests