Table 2.

Definition of key terms used in this guidance

Terminology	Explanation
EREQ Ecotoxicologically Relevant Exposure Quantity	Not a value, but a type of quantity, that gives the best mechanistic link between exposure and effects in an ecotoxicological experiment, and that is calculated/estimated both in the field (PEQ) and the ecotoxicological tests (dose/EED)
PEQ Predicted Exposure Quantity	A value; i.e. the quantification of an EREQ for a specific compound in the field/area of use.
Dose	A value: administered exposure in laboratory ecotoxicological tests
EED Estimated Exposure Dose	A value: estimated exposure in effect field studies