Article 130r(1) of the Treaty authorises the adoption of measures relating solely to certain specified aspects of the environment, provided that such measures contribute to the preservation, protection and improvement of the quality of the environment. In Case 302/86 Commission v Denmark, the Court held that protection of the environment is an imperative requirement which may limit the application of Article 30 of the Treaty. As is clear from the objective of the Regulation and from the considerations set out in this judgment, a prohibition on the use and marketing of HCFCs which is designed to protect the ozone layer cannot be regarded as disproportionate to the aim pursued. Therefore, Council Regulation 3093/94 on substances that deplete the ozone layer is valid.