On May 10, 2012, the Council of the European Union (EU) announced the adoption of a regulation concerning the placing on the market and use of biocidal products, which include insecticides, disinfectants, and repellents, but not medicines or agricultural pesticides. The regulation will take effect September 1, 2013, with a transitional period for certain provisions. The regulation incorporates the European Commission’s (EC) recommendation on the definition of a nanomaterial, and requires that, where nanomaterials are used in a product, the risk to the environment and to health be assessed separately. Labels would be required to include the name of all nanomaterials contained in biocidal products, followed by the word “nano” in brackets. The regulation states that “approval of an active substance shall not cover nanomaterials except where explicitly mentioned.”