Effective date.

§ 171.5 Effective date.

(a) This part is effective March 6, 2017. Certification plans approved by EPA before the effective date remain approved except as provided in §§ 171.5(b)–(d) and 171.309.

(b) Status of certification plans approved before effective date. A certification plan approved by EPA before March 6, 2017 remains approved until March 4, 2020, except as provided in paragraph (c) of this section and § 171.309.

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