In the present-day Europe, with its well-established national air quality and meteorological networks, there are solid ties between the air quality and meteorological agencies and seemingly well-connected data distribution networks. However, there is an increasing need for the orchestration of environmental services spread across the Web in order to provide users with personalised decision support or tailored environmental information. PESCaDO aims to meet this need for environmental service orchestration. It will offer an interconnected multipurpose environmental user-oriented service for a federated community of citizens, public services (such as tourist offices and environmental institutions), public administrations, and entrepreneurs active in sectors sensitive to environmental conditions.