Response to the comment on “Halogenated indigo dyes: A likely source of 1,3,6,8-tetrabromocarbazole and some other halogenated carbazoles in the environment”

•This review examines the origins of some halogenated carbazoles in the environment.•1,3,6,8-Tetrabromocarbazole likely formed in the manufacture of tetrabromoindigo.•Concentrations in dated sediments correlate well with U.S. production history.•Certain other halogenated carbazoles are likely related to halogenated indigo dyes.•Dichlorocarbazole and dibromocarbazole are unlikely to be related to indigo dyes.