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Secondary nonferrous production is addressed as one of the potential sources of unintentional produced persistent organic pollutants（UP-POPs) due to the impurity of raw material. However，the release inventory of Polychlorinated naphthalenes（PCNs) is very scarce for these secondary nonferrous metallurgies. This study selected the typical secondary copper，aluminum，zinc and lead plants to investigate the emissions of PCNs released from secondary nonferrous production in China.