Step 4: Work out your introduction's risk to human health risk
To be able to finish your categorisation you need to work out the risks of your introduction to human health and the environment.
In Step 4, you need to work out the human health risk of your introduction - is it medium to high, low or very low? To work this out start at 4.1 and continue as far as you need to through each step.
Once you have your answer for human health, move to step 5 to work out the risk to the environment of your introduction.
At Step 6, you'll combine the human health risk and environment risk for the final category of your introduction.
Step 4.1 Introductions that are always medium to high risk for human health
Start at this step to see if your introduction is of a type that is always medium to high risk for human health.
Step 4.2 Introductions that can be low risk for human health
This step relates to international assessments and how to work out if your introduction can be low risk for human health based on its international assessment.
Step 4.3 Work out your human health exposure band
Part of the process to work out the human health risk of your introduction is to work out its exposure band. There are 4 human health exposure bands - exposure band 1 has the lowest level of human exposure and exposure band 4 the highest level.
Step 4.4 Work out your human health hazard characteristics
A chemical has a human health hazard characteristic if the chemical can cause damage, harm or adverse effects to humans. Find out what you need to do to establish the human health hazard characteristics of your chemical, including when you can refer to our list of chemicals with high hazards for categorisation.
Step 4.5 Outcome - your human health risk for categorisation
Use the table on this page to confirm the human health risk of your introduction: medium to high, low or very low. After you do this go to step 5 to work out the risk to the environment of your introduction.