SENN2012 – International Congress on Safety of Engineered Nanoparticles and Nanotechnologies (www.ttl.fi/senn2012) 28–31 October 2012, Marina Congress Centre, Helsinki, Finland The goal of the Congress is to examine and discuss safe practices in handling nanomaterials, to promote nanosafety at work with an emphasis on detection methods, tools, and safer production processes, and to improve the understanding of the biological basis of nanosafety. The Congress is targeted at: •researchers in occupational safety and health, •experts in toxicology, material sciences, measurement technologies and risk assessment, management and communication, •policy-makers, •device developers, •safety managers, •administrators in the nanosafety field (eg, safety standards), and •representatives of industry-related research and development.