The present contribution assesses the case law of the European Court of Justice interpreting the provisions of the Aarhus Convention relating to access to justice. Cases have dealt with the temporal scope of application of provisions on access to justice, projects implemented by specific acts of national legislation and their exclusion from the obligations under the Convention, interim relief and the effet utile of provisions on access to justice, the range of possible pleas for judicial review, the role of procedural errors, permissible costs of proceedings, access to justice for environmental associations under different provisions of the Convention and the annulment of a permit and its relationship with the right to property. As is also shown, this case law is at the same time relevant – though not binding – for Switzerland as a non-eu Member State, but party to the Convention.