Fig. 1: Polychlorinated naphthalene emissions from historical production.
From: Global emissions of polychlorinated naphthalenes from 1912 to 2050

a Cumulative emissions of PCNs by phase. WWTP: waste water treatment plant. b Annual emissions of PCNs to environmental media. c Annual emissions of PCN congeners and their share in the environment. Black line refers to total congener emissions. d Historical production material flow analysis of PCNs.