Reports on the measurement of heavy metal contents of solid municipal wastes produced at various sites in Lagos, Ibadan, Ogbomoso, Ilorin, Osogbo, Ile-Ife, Ejigbo, Iwo and Oyo in western Nigeria. Iron, zinc and cadmium levels in high density towns; Mean concentrations of other metals in high and low density towns; Inter-element correlation and significance of some heavy metal environmental levels.