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Engineered nanomaterials (ENM) are already used in many products and consequently released into environmental compartments. In this study, we calculated predicted environmental concentrations (PEC) based on a probabilistic material flow analysis from a life-cycle perspective of ENM-containing products. We modeled nano-TiO₂, nano-ZnO, nano-Ag, carbon nanotubes (CNT), and fullerenes for the U.S., Europe and Switzerland. The environmental concentrations were calculated as probabilistic density functions and were compared to data from ecotoxicological studies. The simulated modes (most frequent values) range from 0.003 ng L⁻¹ (fullerenes) to 21 ng L⁻¹ (nano-TiO₂) for surface waters and from 4 ng L⁻¹ (fullerenes) to 4 μg L⁻¹ (nano-TiO₂) for sewage treatment effluents. For Europe and the U.S., the annual increase of ENMs on sludge-treated soil ranges from 1 ng kg⁻¹ for fullerenes to 89 μg kg⁻¹ …