Workplace safety depends on risk awareness. Employers and workers need to know what dangerous substances are in the workplace and how to deal with them. This e-fact offers hints for successful communication in the workplace about dangerous substances, including the use of safety data sheets, and provides a list of sources of further information. It outlines how two new regulations on chemicals aim to improve communication about the risks of dangerous substances at workplaces. These are on registration, evaluation and authorisation of chemicals (REACH) and classification, labelling and packaging (CLP).