§ 53.1 Definitions.
Terms used but not defined in this part shall have the meaning given them by the Act.
Act means the Clean Air Act (42 U.S.C. 1857-1857l), as amended.
Additive and multiplicative bias means the linear regression intercept and slope of a linear plot fitted to corresponding candidate and reference method mean measurement data pairs.
Administrator means the Administrator of the Environmental Protection Agency (EPA) or his or her authorized representative.
Agency means the Environmental Protection Agency.
Applicant means a person or entity who submits an application for a Federal reference method or Federal equivalent method determination under § 53.4, or a person or entity who assumes the rights and obligations of an applicant under § 53.7. Applicant may include a manufacturer, distributor, supplier, or vendor.
Automated method or analyzer means a method for measuring concentrations of an ambient air pollutant in which sample collection (if necessary), analysis, and measurement are performed automatically by an instrument.
Candidate method means a method for measuring the concentration of an air pollutant in the ambient air for which an application for a Federal reference method determination or a Federal equivalent method determination is submitted in accordance with § 53.4, or a method tested at the initiative of the Administrator in accordance with § 53.7.
Class I equivalent method means an equivalent method for PM 2.5 or PM 10-2.5 which is based on a sampler that is very similar to the sampler specified for reference methods in appendix L or appendix O (as applicable) of part 50 of this chapter, with only minor deviations or modifications, as determined by EPA.
Class II equivalent method means an equivalent method for PM 2.5 or PM 10-2.5 that utilizes a PM 2.5 sampler or PM 10-2.5 sampler in which integrated PM 2.5 samples or PM 10-2.5 samples are obtained from the atmosphere by filtration and subjected to a subsequent filter conditioning process followed by a gravimetric mass determination, but which is not a Class I equivalent method because of substantial deviations from the design specifications of the sampler specified for reference methods in appendix L or appendix O (as applicable) of part 50 of this chapter, as determined by EPA.