Question

Which is more toxic: persistent chemicals or chemicals that break down rapidly?

Answer 1

You cannot say....

Explanation:

Toxicity is the degree to which a substance causes damage to an organism. However, the amount of damage that could be caused is not necessarily related to persistance.

You could have a persistent chemical that causes only minimal damage, or a relatively unstanble substance that is capable of causing massive damage before breaking down.

There is no single hard and fast answer.