### Question
How is the term as expeditiously as practicable defined?


### Answer
The term **as expeditiously as practicable** is defined in *42 U.S.C. § 7491* as the following:

> as expeditiously as practicable but in no event later than five years after the date of approval of a plan revision under this section (or the date of promulgation of such a plan revision in the case of action by the Administrator under section 7410(c) of this title for purposes of this section)

#### Citation:
  - *42 U.S.C. § 7491*
  - Heading: **SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Subchapter Referred to in Other Sections > Part C-Prevention of Significant Deterioration of Air Quality > subpart ii-visibility protection**

