II. Guidance Overview

2 This modeling guidance provides recommendations on how best to conduct a PM2.5

3 NAAQS and increment compliance demonstration under the PSD program. It is based on and is

4 consistent with Appendix W. Appendix W is the primary source of information on the

5 regulatory application of air quality models for SIP revisions for existing sources and for NSR

6 and PSD programs for permitting new and modifying sources.

7 The complex chemistry of secondary formation of PM2.5 is well documented and has

8 historically presented significant challenges with the identification and establishment of

9 particular models for assessing the impacts of individual stationary sources on the formation of

10 this air pollutant (NARSTO, 2004; Seinfeld and Pandis, 1998; Cohan and Napelenok, 2011).

11 Because of these considerations, the EPA's judgment in the past has been that it was not

12 technically sound to assign with particularity specific models that must be used to assess the

13 impacts of a single source on PM2.5 concentrations. Instead, the EPA has chosen to satisfy the

14 requirements of the CAA, Section 165(e)(3)(D) by recommending that the “[c]hoice of methods

15 used to assess the [PM2.5] impact of an individual source depends on the nature of the source

16 and its emissions,” as stated in Section of Appendix W. 4 As such, the appropriate

17 methods for assessing PM2.5 impacts are determined as part of the normal consultation process

18 with the appropriate permit reviewing authority. A modeling protocol should be developed by

19 the permit applicant and approved by the appropriate permitting authority to ensure that the

20 analysis conducted will conform to the recommendations, requirements, and principles of

21 Section 10.2.1 of Appendix W.

4 We


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