Nanomaterials have at least one primary dimension of less than 100 nanometers, and often have properties different from those of their bulk components that are technologically useful. Because nanotechnology is a recent development, the health and safety effects of exposures to nanomaterials, and what levels of exposure may be acceptable, is not yet fully understood.[1]:1–3 Processing and manufacturing of nanomaterials involve a wide range of hazards. The types of engineering controls optimal for each situation is influenced by the quantity and dustiness of the material as well as the duration of the task.