111In those circumstances, it is for the Member States to take appropriate and consistent measures aimed at compliance with the limit value, having regard to all the material circumstances and the interests in play (see, to that effect, Case C-320/03 Commission v Austria, paragraph 81, and Case C-237/07 Janecek [2008] ECR I-6221, paragraphs 45 and 46). While they have a discretion in that respect, they must none the less exercise it consistently with the provisions of the EC Treaty, including the fundamental principle of the free movement of goods.
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