What does it mean if a chemical is persistent or bioaccumulative?



Persistent chemicals are not easily broken down in the environment. They stay in air, water and soil for a very long time, with a longer window of opportunity to be absorbed by people.

Chemicals that bioaccumulate increase in concentration in the tissues of living organisms at higher levels than those found in the surrounding environment. These types of chemicals build up in the tissues of living organisms because the chemicals are drawn to biological fluids and tissues such as fats.