Online control banding and risk management tool for manufactured nanomaterials. Hazard assessment and case-specific exposure potentials are combined into an integrated assessment of risk levels expressed in control bands with associated risk management recommendations. It can also be used to assess and manage emissions from nanoparticle-forming processes. Uses data on material properties, processes and production facilities to estimate occupational risk. The tool uses the Risk Quotient (i.e. the ratio of an exposure dose to a human effect threshold) to estimate risk deterministically. The tool is capable of estimating exposure from spray processes and it can perform nano-specific Hazard Assessment based on read-across between NPs based on specific material properties and hazard indicators, tested for performance against in vivo experiments.