Current production of carbon nanotubes has reached several thousand tons per year. CNTs used as bulk powder have already been incorporated in various commercial products, from sporting goods, batteries to water filters and concrete alloys. Future applications include field emission displays, supercapacitors, chemical sensors and in the longer term, as components for biomedical devices. With increased production expected to fulfil such needs and the widespread use of the material, exposure of workers, consumers and patients needs to be investigated.