In 2005 a Work Group was established between Denmark, Finland, Norway and Sweden with the intention to exchange information related to the development of national action plans to follow up the Children's Environment and Health Action Plan for Europe (CEHAPE), adopted at the Fourth Ministerial Conference on Environment and Health in Budapest 2004. This Work Group has been supported with funding for 2005-2006 from the Nordic Council of Ministers' Committee of Senior Officials for Social and Health Affairs. The Work Group decided to develop a catalogue of case studies on good practices in environmental health. These case studies should be seen as examples where there has been recent activity related to children's environmental health in the Nordic countries. Hopefully, the cases may give inspiration to additional activities aiming at providing the best possible environment and health for children.