This article presents findings from a European project co-ordinated by the National Institute of Public Health, Denmark. The project "Children and noise--prevention of adverse effects" was partly financed by the European Commission Programme on Pollution-related Diseases and included partners or consultants from six European Union Member States: Denmark, Germany, Italy, the Netherlands, Sweden and the United Kingdom. The project used a definition of noise based on children's special development and provides examples of good practice on how to prevent the harmful effects of noise in children's daily settings. The settings analysed were day-care centres, primary schools and discotheques. Two methods were applied to obtain the effective examples of noise prevention or noise reduction: reviewing existing research and interviewing key people with knowledge and experience that has not yet appeared in the literature. A range of cases of preventing the adverse effects of noise assessed before and after the intervention provide a number of good practices, including information and awareness-raising campaigns and the identification of key concepts and key players in the prevention of noise. The examples of good practice have been effective in reducing noise, reducing the effects of noise, increasing the awareness of the importance of noise reduction or increasing action to reduce noise. The examples are based on a common format for reviewing preventive measures and can serve as direct inspiration for action to prevent noise in children's daily settings.