NANEX (Development of Exposure Scenarios for Manufactured Nanomaterials) is a European research program whose aim is to develop a catalogue of generic and specific (occupational, consumer and environmental release) exposure scenarios for MNMs taking account of the entire lifecycle of these materials. NANEX will collect and review available exposure information, focussing on three very relevant MNMs: (1) high aspect ratio nanomaterials- HARNs) (e.g. carbon nanotubes); (2) mass-produced nanomaterials (e.g. ZnO, TiO2, carbon black); and (3) specialised nanomaterials that are currently only produced on a small scale (e.g. Ag). The exposure information will include both quantitative (measurement results) and qualitative contextual exposure information (risk management measures).