Rapid growth in the nanoparticle industry is anticipated in the Nordic countries owing to highly focused national research and investment initiatives. Knowledge on consequences for occupational exposures to engineered nanoparticles and appropriate technical control levels is still limited. This report explores existing knowledge on exposure risks and technical control approaches. The report concludes that data are too limited to allow general conclusions to be drawn regarding risks of exposure to engineered nanoparticles. Engineering techniques for controlling nanoparticle exposure can build on the current knowledge and approaches to control exposure to e.g. welding fume and carbon black. There is a need for improving the quality of information provided in Material Safety Data Sheets.