Ecotoxicology Database contains substances listed in the NORMAN substances with their Lowest PNEC, which were either predicted by QSAR or obtained experimentally. Experimental and predicted Lowest PNECs, which were voted by NORMAN ecotoxicology experts are addressed as 'verified'.

The Lowest PNECs are used primarily for the prioritisation purposes.

Most of the Lowest PNECs were derived for freshwater. Unless there is an experimental value for other matrices, the following calculations were used for derivation of the Lowest PNECs in:

No. of substances in the database: