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§ 52.01 Definitions.
All terms used in this part but not defined herein shall have the meaning given them in the Clean Air Act and in parts 51 and 60 of this chapter.
(a) The term stationary source means any building, structure, facility, or installation which emits or may emit an air pollutant for which a national standard is in effect.
(b) The term commenced means that an owner or operator has undertaken a continuous program of construction or modification.