Organochlorine compound residues in human milk in the United Kingdom 1989-1991.

1. The concentrations of some organochlorine pesticides and polychlorobiphenyls have been determined in 193 samples of human milk collected between July 1989 and July 1991. 2. Comparison of the results with those from previous studies in 1979-80, and earlier, shows a continuing decline in residue levels except for polychlorobiphenyls. 3. The concentrations of organochlorine pesticides and polychlorobiphenyls in human milk samples from residents in the United Kingdom compare favourably with data obtained in other countries.