Simulation of the Release of Nanomaterials from consumer products for environmental exposure assesment. Sirena is a project co-funded by the European Community under the LIFE+ Financial Instrument, under the Grant Agreement LIFE 11 ENV/ES/596. The main goal of SIRENA is to demonstrate and validate a methodology to simulate the unintended release of NMs from consumer products by replicating different life cycle scenarios to be adopted by a wide number of industrial sectors in order to get the necessary information for exposure assessment.