12 IV.1 Modeling Inventory

13 The current guidance on emission inventories for purposes of NAAQS compliance

14 modeling contained in Section 8.1 of Appendix W will generally be applicable for the PM2.5

15 modeling inventory. The guidance in Appendix W addresses the appropriate emission level to

16 be modeled, which in most cases is the maximum allowable emission rate under the proposed

17 permit. The remainder of this section will focus on the modeling inventory of direct PM2.5

18 emissions that should be used in dispersion modeling of primary PM2.5 impacts. Although the

19 EPA’s “Guidance on the Use of Models and Other Analyses for Demonstrating Attainment of

20 Air Quality Goals for Ozone, PM2.5, and Regional Haze” (U.S. EPA, 2007a) provides some

21 guidance relevant to applications involving full quantitative photochemical grid modeling,

22 additional considerations and guidance regarding modeling inventories for such analyses in

23 support of PM2.5 NAAQS compliance demonstrations under this guidance will be addressed on a

 

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