Hazardous wastes are also defined internationally elsewhere (e.g. Basel Convention and in European Union legislation), but in slightly differently ways to the OECD. Some examples of hazardous waste streams are wastes from the generation and use of biocides, wood preserving chemicals, organic solvents, polychlorinated biphenyls (PCBs). Some examples of hazardous constituents in waste are metal carbonyls, arsenic, cadmium, mercury, inorganic cyanides, acidic solutions or acids in solid form and asbestos.