Abstract:To investigate the air pollution level, characteristics and occupational inhalation exposure of PCDD/Fs in an automobile foundry, fine particles and gas phase of air in workshops, nearby residential areas and remote background area were collected and analyzed. The results showed that (1) the mean concentration of PCDD/Fs in the workshop was 4.18pg/m3, which was 21times higher than background area and 4times higher than residential areas, and the shakeout zone showed the highest level; (2) for I-TEQ concentration, the mean value of the workshops was 0.282pg I-TEQ/m3and the highest value was found in the cadmium mineralization zone (0.480pg I-TEQ/m3), fortunately, all the results were below the annual air quality control limit of Japan (0.6pg I-TEQ/m3); (3) estimated occupational inhalation exposure dose to PCDD/Fs ranged from 0.02~0.25pg I-TEQ/(kg·d) in the different workshops, and the workers in the cadmium mineralization zone were bearing the highest PCDD/Fs exposure risk in the factory.