Equivalent method
Equivalent method means a method of sampling and analyzing the ambient air for an air pollutant that has been designated as an equivalent method in accordance with part 53 of this chapter; it does not include a method for which an equivalent method designation has been cancelled in accordance with 53.11 or 53.16 of this chapter.
Source
40 CFR § 50.1
Scoping language
As used in this part, all terms not defined herein shall have the meaning given them by the Act.