Definition

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 40 CFR Part 53. A FEM does not include a method for which an equivalent method designation has been canceled in accordance with 40 CFR Parts 53.11 or 53.16.

Definition and Description

An Equivalent Method (FEM), is defined as a specific technique for assessing the concentration of an air pollutant in the surrounding atmosphere. It has received an official designation as a reliable and accurate method for this purpose. It’s important to note that a FEM does not include methods for which the equivalent method designation has been revoked, as outlined in 40 CFR Parts 53.11 or 53.16. of EPA guidelines