The requirements for how a EPD is to be created is specified in the ISO-standard 14025 Environmental Labels and Declarations Type III.
An EPD is made on the basis of a life cycle analysis (LCA) specified by ISO 14040-14044. The standardized method ensure environmental information within the same product category can be compared from product to product, regardless region or country. The purpose is that the customer will be able to compare the environmental profile and make an assessment and choice based on the environmental declaration.
Verified environmental declarations ensure environmental information according to the four requirements: objectivity, comparability, credibility and addibility.