The application of the precautionary principle in the assessment and management of uncertain and potentially serious risks to environment or to public health has shown some ambiguity in the interpretation of the concept of precaution, insufficient knowledge of the potential effects of activities that may cause risk and lack of mechanisms and operational frameworks to support decisions. This has hindered the functioning of administrative justice and generated discretion and unpredictability in the decision process. This study intends to clarify how the precautionary principle has been interpreted and applied by the courts in Portugal in the analysis of conflicts associated with the existence of uncertain risks to the environment or to public health and to contribute to the debate on when and how to apply precautionary measures. To this end, a recent set of relevant court cases is considered in areas involving public health and environmental risks and the application of the precautionary principle. The decisions of the courts and their reasons in the different judicial bodies are analyzed. In order to evaluate the degree of consistency of the courts’ decisions in relation to comparable risks and their proportionality with respect to the seriousness of risks, a theoretical framework is developed based on the level of seriousness of risk, the level of evidence required and the level of severity of precautionary measures. Different positions among courts are observed, with contradictory arguments in the same case or in similar cases. The existing risks are admitted but with different levels of seriousness, requiring different levels of evidence and giving priority to different interests. Therefore, in order to counteract the lack of clear and insufficient information on existing uncertainties, leading to the perception of different levels of seriousness of risks and to divergent decisions, more explicit legal requirements and criteria are proposed for the analysis of uncertain risks and the balancing of interests in different areas of activity and also for the proportionality of the decisions. In this context, courts should have the technical support of high quality scientific expertise in the analysis of environmental and economic information.

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• Economia e Gestão - Ciências Sociais