Universitat Rovira i Virgili (URV). A “Campus of International Excellence” in the south of Catalonia. This public university has consistently been ranked as one of the top five Spanish Universities in terms of scientific productivity, internationalization capacity and teaching excellence. The role of URV is data management and analysis, model development, and eNP categorization. Project coordination and leadership of WP2 and WP5.

Helmholtz Centre for Environmental Research (UFZ). It currently employs around 1000 people, with recognized expertise in research into land use options & biodiversity, water and soil resources and into human and environmental health as affected by chemical substances. UFZ will develop molecular descriptors and QNPR and QNAR based models. Leadership of WP1.

Aarhus University (AU). The National Environmental Research Institute does basic and applied research on soil fauna ecology, ecophysiology and ecotoxicology, and nanoparticle ecotoxicology. It belongs to the University of Aarhus, which is currently listed among the top 100 best universities globally. AU will provide ecotoxicity data and contribute to eNP ranking and basic risk assessment. Leadership of WP3.

National Institute of Chemical Physics and Biophysics (NICPB). This research institution carries out fundamental and applied research and engages in the development of the novel directions in material sciences, gene- and biotechnology, environmental technology, and computer science. NICPB will generate the data needed for model validation and testing of safe-by-design hypothesis. Leadership of WP4.

Universität Bremen (UniHB). The University of Bremen is a mid-sized university entitled ‘University of Excellence’ since 2012. The Particle and Process Engineering group will provide expertise on synthesis, processing, modeling and characterization of particles in the gas phase, and contribute with data on physicochemical characterization of eNPs, synthetize and characterize eNPs to validate models and safe-bydesign hypothesis and contribute to the validation of QNPR and eNP categories.

Tartu Ulikool (UT). The University of Tartu is one of the biggest and the oldest university in the Baltic region. The Chair of Physical Organic Chemistry has expertise in the development and encoding of methods for QSAR/QSPR in Natural Sciences and in the development of molecular descriptors for structure-activity analysis, including nanostructures.

University of California, Los Angeles (UCLA). UCLA hosts the NSF and EPA funded UC Center for Environmental Implications of Nanotechnology (CEIN), whose mission is to ensure that nanotechnology is introduced in a responsible and environmentally compatible manner. UCLA-CEIN will provide experimental nanotoxicity data and will contribute to validate models, eNP categories and hazard ranking schemes.