Section 3 describes the recommended modeled attainment tests.
Section 4 describes the attainment test for ozone in more detail.
Section 5 describes the attainment tests for each of the two NAAQS for PM2.5.in more
Section 6 outlines a recommended analysis to assess uniform rate of progress at Class I
Section 7 describes how supporting analyses should be performed to complement the
attainment test and the uniform rate of progress analysis, as well as how it should be used in a
weight of evidence determination.
Section 8 identifies several data gathering activities and analyses which States/Tribes
could undertake to enhance the credibility of the modeling and corroborative analyses to support
subsequent reviews on progress toward attainment and/or visibility improvements.
Section 9 identifies the documentation necessary to adequately describe the analyses
used to demonstrate attainment of the ozone NAAQS.
Part II (“How should I apply air quality models to produce results needed to help
demonstrate attainment?”) begins in Section 10 with an overview of the topics to be covered.
Section 11 identifies a series of meteorological, emissions and air quality data analyses
which should be undertaken to develop a qualitative description of an area’s nonattainment
problem prior to a model application. As we describe, this qualitative description should be used
to guide the subsequent model application.
Section 12 describes the purpose, function, and contents of a modeling protocol.
Section 13 addresses what criteria should be considered in choosing a model to support
the ozone and PM attainment demonstrations and uniform rate of progress analyses. Several
guidelines are identified for accepting the use of a model for this purpose.
Section 14 provides guidance for selecting suitable time periods (or episodes) to model
for an attainment demonstration or uniform rate of progress analysis. Topics include a
discussion of the form of the NAAQS and its resulting implications for episode selection.
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