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BTEX are made up of naturally-occurring chemicals that are found mainly in petroleum products such as gasolines or naphtha. BTEX can enter the environment from leaking underground storage tanks (UST's), overfills of storage tanks, fuel spills from auto accidents and from landfills.
Source: EUR-Lex (Cellar) · retrieved 2026-09-25 · Text as adopted (Official Journal); later amendments are not incorporated in this text.