Abstract: Objective To assess the occupational health risk level of manganese exposed workers in welding position of moped manufacturing industry. Methods In 2023,two typical moped manufacturing enterprises in Wuxi City were selected to evaluate the occupational health risks of manganese exposed workers in welding positions by using the inhalation model of U.S. Environmental Protection Agency（EPA）. Results The EPA model was used for non carcinogenic risk assessment of manganese and its compounds,and it was found that welding positions in both enterprises showed high risk,with the risk values of 238-1 468. However,the evaluation results of the GBZ/T 229.2-2010 Classification of Occupational Disease Hazards in the Workplace Part 2：Chemicals showed that the welding positions of these two enterprises were classified as relatively harmless to mild hazard. Conclusion The inhalation risk assessment model of U.S. EPA has higher sensitivity to manganese exposure positions in moped manufacturing enterprises,and can more effectively identify dangerous operations,and quantify the hazard degree according to the risk value,so as to help determine key positions and take corresponding prevention and control measures.

Key words: Moped manufacturing, Manganese, Occupational health risk assessment, EPA inhalation model