Background Reducing the burden of diseases associated with environmental health risks is a European priority. In 2004, during the fourth ministerial conference on environment and health, the Children’s Environmental and Health Action Plan for Europe (CEHAPE) was drafted. This set regional priority goals for European countries to reduce and, where possible, eliminate children’s exposure to environmental health risks. The evaluation of the social and economic costs and benefits of action and inaction was among the main measures encouraged by the conference. The priority of protecting children from environmental pollution was also part of the Parma Declaration signed in 2010. These documents emphasise the importance of involving young people in decision-making processes; encouraging the creation of participative tools for the development of environment and health indicators; and implementing initiatives on the perception of risk, its assessment, management and communication. Objectives The main objective of the LIFE GIOCONDA project is to provide local authorities with an innovative methodology that can effectively support policies on environment and health, by involving young people in decision-making processes. Data relating to air and noise pollution conditions will be collected in four project cities: Napoli, Taranto, Ravenna and Valdarno. This will be combined with data assessing the risk perception of teenagers, and their willingness-to-pay for local services related to environmental health issues, in order to develop and test an online platform to facilitate the application of environmental and health risk governance and policies. The platform will include a tool that allows decision makers to estimate costs and benefits of policies involving air pollution and/or noise exposure reductions that target young people’s health, and a tool that enables schools to measure the pupils’ perception of their surrounding environment. Expected results: Online platform with two distinct tools (to support knowledge-based and local environmental health policies); Platform made available to decision makers and to a wide range of professional figures at both national and local levels, including local authorities, schools, civil society (e.g. environmental associations, medical associations, parents’ associations and youth councils); Platform used by four partner municipalities and tested by at least two further municipalities; Eight schools and their local administrations, plus about 650 students, the same number of parents, around 30 teachers, and at least 50 stakeholders including policy-makers involved in project activities; and At least 2 000 stakeholders reached and informed about the project’s outcomes.