This module is designed to reflect the current knowledge on the hazardous properties and exposure pathways of MNO. To come to a first prioritization of risks, understandable as well as readily available information has been used. New knowledge or more advanced insights may lead to model changes. Stoffenmanager Nano is under development and therefore the current version should not be considered a final version. Model adjustments will be clearly communicated on the website. Guarantees, for maintaining currently present user data after possible model adjustments, can not be given.