Background Level:

1. The concentration of a substance in an environmental media (air, water, or soil) that occurs naturally or is not the result of human activities. 2. In exposure assessment the concentration of a substance in a defined control area, during a fixed period of time before, during, or after a data-gathering operation..

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Information and definitions of the terms been taken from various reliable government publications and we have done our best to verify their accuracy. If you feel any of the definitions are incorrect or needs to be updated please contact us and we will look into it.

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