Green food refers to the safe, high-quality and nutritious food that is produced according to the principle of sustainable development and approved by special institutions (Figure 2) and has no pollution. Green food certification refers to the process that an authoritative third-party organization tests the food according to the relevant standards of green food, issues an inspection report, and grants the green food mark to the food that meets the standards.

At present, green food standards are divided into two technical levels, namely AA-level green food standards and A-level green food standards.

AA-grade green food refers to the products whose production environment meets the requirements of NY/T391-2111 Environmental Quality Standard for Green Food Production Areas, and the production process does not use chemically synthesized fertilizers, pesticides, veterinary drugs, feed additives, food additives and other substances harmful to the environment and health. The products are produced in an organic way, and the product quality meets the standards of green food products, and are approved to use AA-grade green food marks by specialized agencies.

A-grade green food refers to the products whose production environment meets the requirements of NY/T391-2111, whose production process is strictly in accordance with the requirements of the guidelines for the use of green food production materials and production operation procedures, and whose product quality meets the standards of green food products, and which are approved to use the A-grade green food mark by specialized agencies.