The EU follows the precautionary approach when regulating use of actually or potentially "toxic" substances used in products. Therefore, manufacturers, consumers and others have an interest in regulatory decisions. But, EU law apparently has been unclear on standing to challenge regulations, until a recent decision in a case known as Microban. The decision is explained – at length – in this post from Eutopia Law – a blog from Matrix Chambers. Also read this "about" page for some insight into the blog name and its overall significance.
Hat tip to Opinio Juris for the link to Eutopia.