A wide range of industrially synthesized nanomaterials are present in products we use daily and, in the meantime, are part of our everyday life. Due to their exceptional properties (e. g., increased UV-filtration or stronger adhesion) they are used in clothes, cosmetics, household goods and paints. But where do these particles, each measuring just a few millionths of a millimeter, end up? What impact do they have on humans and the environment? How dangerous are they really? In order to find answers to these questions, 11 partners from business and science, as well as Federal and State authorities are developing new, innovative methods for precise and safe evaluation of nanomaterial contamination and the resulting risk potential for humans and the environment within the framework of the project "NanoUmwelt: risk analysis of engineered nanomaterials in the environment".