The goals for regional haze between the base period and 2018 relate to trends in light

extinction rather than to some absolute value, as is the case for the NAAQS. Thus, supplemental

analyses differ in some respects for visibility-related applications. Section 7.3 describes how to

use supplemental analyses in regional haze analyses.

7.1 What Types of Additional Analyses Should Be Completed as Part of the

Attainment Demonstration?

There are three basic types of analyses that are recommended to supplement the primary

modeling analysis. They are:

1) Additional modeling

2) Analyses of trends in ambient air quality and emissions

3) Observational models and diagnostic analyses

These broad groups of supplemental analyses are discussed in more detail below:

Modeling: The relative attainment tests described in sections 3, 4, and 5 are the primary

modeling tools used in an attainment demonstration. The application of a photochemical grid

model, developed on a regional or local scale, is the best tool available to judge the impacts of

changes in future year emissions. In addition to this “primary” modeling analysis, there are

various other models, applications, and tools that can be used to supplement the results of the

modeled attainment test. These include, but are not limited to:



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