Pollution-free agricultural products refer to agricultural products that are not polluted by harmful substances. Under the current conditions, there can only be relative standards, not absolute standards. Therefore, pollution-free agricultural products actually mean that commercial agricultural products do not contain some toxic substances that are not allowed by regulations, while some inevitable harmful substances should be controlled within the allowable range to ensure people's food safety. To sum up, pollution-free agricultural products must meet the following conditions in addition to reasonable flavor and nutrient content:

1, pesticide residues do not exceed the standard. Pollution-free agricultural products do not contain prohibited highly toxic pesticides, and other pesticide residues do not exceed the allowable standards.

2. The nitrate content does not exceed the standard. The nitrate content in edible agricultural products does not exceed the standard allowable amount, and is generally controlled below 432ppm.

3, "three wastes" and other harmful substances do not exceed the standard. Pollution-free agricultural products must avoid the harm caused by environmental pollution, and the contents of "three wastes" and harmful substances of pathogenic microorganisms in commercial vegetables should not exceed the standard allowable amount.