The Terminology Reference System (TRS) has been created as a single resource of environmental terminology for the Agency by compiling collections of terms from EPA and other sources.
Click on a letter/number below to retrieve a list of all terms beginning with that letter or number. Other ways to query TRS information may be found on the
Search
page.
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Enter a keyword (e.g., pollution) or text string (e.g., regulated substance) to search either a term or definition.
Please read the
SoR Disclaimer
for the Terminology Reference System. The
Introduction and
Help pages provide information to assist in understanding and using the TRS.
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