Find existing standards 

Standards relevant to environmental protection cover a wide range of issues. Best known is EN ISO 14001, the international standard for environmental management. Other areas covered by standards include air quality, biodiversity, eco-design of energy-related products, electric vehicles, energy management, nanotechnologies and water footprinting to name but a few.
If you are looking for a specific standard, the CEN and CENELEC web sites allow you to search the entire collection of published standards and standards under development. To search for:
You can search for standards by title (in English, French and German) and by standard reference. 
You can also search the scopes of standards to help you identify standards relevant to you.