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Note: EPA no longer updates this information, but it may be useful as a reference or resource.

Please see www.epa.gov/nsr/ for the latest information on EPA's New Source Review program.

December 16, 1980 Interpretation of "Significant Contribution" 12.2

Discusses the concept of significant impact when assessing whether a source locating in a PSD area would contribute to air pollution in excess of the NAAQS.

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