For the purposes of subsection (a), the term “imminently hazardous chemical substance or mixture” means a chemical substance or mixture which presents an imminent and unreasonable risk of serious or widespread injury to health or the environment, without consideration of costs or other nonrisk factors. Such a risk to health or the environment shall be considered imminent if it is shown that the manufacture, processing, distribution in commerce, use, or disposal of the chemical substance or mixture, or that any combination of such activities, is likely to result in such injury to health or the environment before a final rule under section 2605 of this title can protect against such risk.
15 U.S. Code § 2606 - Imminent hazards
 So in original. Probably should be “Subpoenas”.
2016—Subsec. (a)(1). Pub. L. 114–182, § 19(f)(1), in concluding provisions, substituted “a determination under section 2604 or 2605 of this title, a rule under section 2603, 2604, or 2605 of this title or subchapter IV, an order under section 2603, 2604, or 2605 of this title or subchapter IV, or a consent agreement under section 2603 of this title” for “a rule under section 2603 of this title, 2604 of this title, 2605 of this title, or subchapter IV or an order under section 2604 of this title or subchapter IV”.
Subsec. (a)(2). Pub. L. 114–182, § 19(f)(2), substituted “section 2605(d)(3)(A)(i)” for “section 2605(d)(2)(A)(i)”.
1992—Subsec. (a)(1). Pub. L. 102–550 substituted “section 2603 of this title, 2604 of this title, 2605 of this title, or subchapter IV” for “section 2603, 2604, or 2605 of this title” in last sentence.
Pub. L. 102–550, which directed the insertion of “or subchapter IV” after “2604”, was executed by making the insertion after “2604” the second time appearing in last sentence, to reflect the probable intent of Congress.