Current challenges and coming opportunities in nanoparticle risk assessment

Abstract This chapter discusses the key aspects of engineered nanomaterial (ENM) toxicity. The individual properties of ENMs affecting their toxic potential are described, with a special focus on size, shape, and surface charge and functionalization. We present empirical evidence from a range of in vitro and in vivo studies showing potential adverse effects induced via inhalation, ingestion, or skin contact with ENMs, as well as a brief overview of human studies and nanoecotoxicology. Finally, a summary of current guidelines and frameworks is provided, together with a collection of the most prominent nanosafety projects and resources available for the assessment of nanotoxicity. This literature review demonstrates that there is a need for the collection of standardized data from human studies to inform epidemiological studies. Moreover, despite the wide usage of ENMs and reported toxic potentials, there is a shortage of policies regulating the exposure and usage of ENMs to protect both the environment and human health.