title: Persistent pesticides and PCBs in the environment.
mesh_terms: D004777:Environment; D004787:Environmental Pollution; D007306:Insecticides; D010573:Pesticide Residues; D011078:Polychlorinated Biphenyls
chemical_list: D007306:Insecticides; D010573:Pesticide Residues; D011078:Polychlorinated Biphenyls