Occupational Health Risk Assessment of Benzene, Toluene, and Xylene in Shanghai.

Objective: This study was designed to conduct a retrospective and systematic occupational health risk assessment (OHRA) of enterprises that used benzene, toluene, and xylene (BTX) in Shanghai, China.

Methods: All data for the study were obtained from 1,705 occupational health examination and evaluation reports from 2013 to 2017, and a semiquantitative model following Chinese OHRA guidelines (GBZ/T 298-2017) was applied for the assessment.

Results: The selected enterprises using BTX were mainly involved in manufacturing of products.