not consider the impacts of the rule changes for each type in detail; instead, it is focusing on a few representative industries.

Because many of the outcomes that the committee has been asked to consider can be affected by a number of factors outside the realm of the NSR rules, other factors, such as economic conditions and government investment in research and development, will be considered in the committee’s analyses. The committee recognizes that future developments in other pollution laws and regulations can have a substantial influence on the impacts of NSR rule changes. Thus, the committee will strive to consider the plausibility, significance, and interactions of other relevant requirements. This approach will be refined as the study progresses.

Because it has not completed the process of information gathering and analyses, the committee has not reached its final conclusions or recommendations in response to its charge from Congress. Those will be presented in the final report.


This interim report provides a synthesis of background information on relevant health effects, air quality indicators, emissions, and industry activities in a regulatory context. The report also describes the approach that the committee plans to use for assessing the impacts it has been asked to address.

To establish a background and context for the committee’s technical and scientific analysis, Chapter 2 provides a regulatory overview of the NSR programs in the context of the CAA. It also describes and discusses the NSR rule changes that are the subject of the committee’s evaluation. Chapter 3 examines contributions that emission sources subject to NSR may make to ambient air quality and relationships between specific air pollutants and health effects. Chapter 4 considers the categories of industrial sources involved in permitting activity under NSR, typical repair and replacement issues for those source categories, and typical technological considerations for those categories. Chapter 5 discusses various methods that have been used or that might be used in the future to assess the effects of the NSR rule changes, and it discusses other information that should be considered in analyses of the probable impacts of NSR rule changes. Chapter 6 provides the committee’s planned general approach for considering the impacts of NSR rule changes as a guide to the analysis undertaken by the committee for its final report.

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