Since the interior atmosphere represents a major part of the built environment, determining emissions from those sources which influence indoor air quality is of great importance. Recently, interest has been focussed on flame retardants (FR) which have been increasingly used in consumer and building products in combination with a rapid increase in the use of plastics. The aim of the research project initiated by the Federal Environmental Agency (Germany) is the investigation of the emission behaviour of selected FRs from interior-relevant products.