ECEL
ECEL is an Existing Chemical Exposure Limit, and means an airborne concentration calculated as an eight -hour time-weighted average (TWA).
Source
40 CFR § 751.5
Scoping language
The definitions in section 3 of the Toxic Substances Control Act, 15 U.S.C. 2602, apply to this part except as otherwise established in any subpart under this part.