1 The concentrations of some organochlorine pesticides and polychlorobiphenyl compounds have been determined in 102 samples of human milk collected between January 1979 and September 1980.
2 Comparison of the results with those from a limited study undertaken in 1963-4 shows a decline in residues' levels.
3 The concentrations of organochlorine pesticides and polychlorobiphenyls in human milk samples from residents in Great Britain compare favourably with data obtained in other countries.
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