CSA

Combined statistical area (CSA) is defined by the U.S. Office of Management and Budget as a geographical area consisting of two or more adjacent Core Based Statistical Areas (CBSA) with employment interchange of at least 15 percent. Combination is automatic if the employment interchange is 25 percent and determined by local opinion if more than 15 but less than 25 percent.

Source

40 CFR § 58.1

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Scoping language

As used in this part, all terms not defined herein have the meaning given them in the Clean Air Act.

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