Federal equivalent method (FEM) means a method for measuring the concentration of an air pollutant in the ambient air that has been designated as an equivalent method in accordance with this part; it does not include a method for which an equivalent method designation has been canceled in accordance with 53.11 or 53.16.


40 CFR § 53.1

Scoping language

Terms used but not defined in this part shall have the meaning given them by the Act.

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