Primary monitor

Primary monitor means the monitor identified by the monitoring organization that provides concentration data used for comparison to the NAAQS. For any specific site, only one monitor for each pollutant can be designated in AQS as primary monitor for a given period of time. The primary monitor identifies the default data source for creating a combined site record for purposes of NAAQS comparisons.

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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