Under the Clean Air Act, sources frequently must undergo “New Source Review” (NSR) permitting, which is a pre-construction permitting program. NSR establishes requirements for new or modified sources prior to initiating construction. The goal of NSR is to ensure that newly constructed or modified sources consider their air emissions and protect the air quality of the geographic area in which they are located. To that end, there are two types of NSR permits: PSD (prevention of significant deterioration) and NNSR (nonattainment new source review). PSD permits are for those sources located in areas that are attaining National Ambient Air Quality Standards (NAAQS), and therefore the permit is designed to prevent significant deterioration of air quality. Alternatively, NNSR permits are for those sources located in areas that are not achieving the NAAQS and are considered to be in non-attainment of air quality standards.
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