TRC

White Paper   |   Dec 1st, 2014 Review and Recommendations for TCE Short-Term Action Levels in Indoor Air

Confusion and misinterpretation is the state of the 2014 regulatory environment as it pertains to short- term trichloroethylene (TCE) action levels for indoor air. The issue starts with comprehension of the United States Environmental Protection Agency’s (EPA’s) TCE toxicity profile, released in September 2011 (EPA, 2011), that lowered the non-cancer inhalation toxicity value (reference concentration [RfC]) from 10 micrograms per cubic meter (ug/m3) to 2 ug/m3, which is equivalent to a reduction from 1.9 parts per billion by volume (ppbv) to 0.4 ppbv. This decrease is equivalent to a 5-fold increase in noncancer risk.

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