Abstract：The pollution level, emission characteristics and exposure risk of PCDD/Fs from a number of waste recycling enterprises were investigated in a certain province of China. The results showed that the TEQ values of PCDD/Fs in the flue gas samples ranged from 0.0796 to 0.478ng/m3(I-TEQ) with an average value of 0.194ng/m3(I-TEQ). In addition, the level of PCDD/Fs in plastic waste recycling industry was higher than the current standard limit(0.1ng/m3). The concentrations of PCDD/Fs in the ambient air samples of waste recycling enterprises area ranged from 0.256 to 2.15pg/m3 (I-TEQ) and the reference point ranged from 0.0356 to 0.178pg/m3(I-TEQ). The results of fingerprint analysis showed that high-chlorinated monomers including OCDF, OCDD, 1,2,3,4,6,7, 8-HpCDF and 1,2,3,4,6,7,8-HpCDD were the primary PCDD/F congeners in the flue gas and ambient air samples. 2,3,4,7,8-PeCDF was the most dominant congener contributing to TEQ values. The concentration of PCDFs was higher PCDDs in the ambient air samples, which was characterized by heat source. The exposure risk assessment suggested that human exposure to PCDD/Fs via inhalaition for the residents living in the studied area was at a relatively safe level. The contribution rate of respiratory exposure to PCDD/Fs for some individuals exceeded the evaluation standard and deserves more attention.
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