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PRIO – A tool for Risk Reduction of Chemicals

How hazardous is your substance?

You now know which substance you are looking for and whether there is legislation associated with the use of this substance. The next step is to find out if the substance has any hazardous environmental and health properties, and if these are covered by the criteria in PRIO.

The easiest way to do this is to search via the CAS number, EU number or name of the substance in the PRIO examples database. If the substance is in the database you will find information concerning the hazardous environmental and health characteristics of the substance, whether it is covered by any of the PRIO criteria, and it will also be indicated if the substance is being phased out or is a prioritised risk reduction substance.
Search in the database

If you find the substance in the database you can now continue to the next question in the prioritisation guide. Go straight to the question

What should I do if I do not find the substance in the database?

If the substance is not in the database, you should compare the properties of the substance with the PRIO tool criteria to examine whether it should be regarded as a phase out substance or as a prioritised risk reduction substance. You can get more information about how to make this assessment in Chemicals in practical use, Hazard assessment.

Continue with the prioritisation guide

Your comparison of the characteristics of the substance with the PRIO tool environmental and health criteria will lead to either a response that the substance is not covered by the criteria or that the substance is a phase out substance or is a prioritised risk reduction substance. Now continue with the prioritisation guide.


To which level of prioritisation does your substance belong?

Risk reduction substance

Phase-out substance

Substances not fulfilling the criteria