ABC - DEF - GHI - JKL - MNO - PQRS - TUV - WXYZ Background level(s)
Definition:
Levels of chemical or physical agents that are normally found in the
environment.
Two types of background levels may exist for chemical substances or physical
agents: (a) Naturally occurring levels: ambient concentrations of substances or
agents present in the environment, without human influence; (b) Anthropogenic
levels: Concentrations of substances or agents present in the environment due to
human-made, non-site sources (e.g., automobiles, industries).
Source & ©:
US EPA Glossary of IRIS Terms
ABC - DEF - GHI - JKL - MNO - PQRS - TUV - WXYZ | 
