Produkt- og senere industrirclateret miljølovgivning var baseret på Traktatens artikel 100, som dækker harmonisering af den lov givning i medlemsstaterne, som "har direkte indvirkning på fællesmarkedets
Product and later industry-related environmental legislation was based on Article 100 of the Treaty, which covered the harmonisation of laws 'in Member States as having a direct impact on the establishment or functioning of the common market.'